noun
                                                a person who keeps watch over something or someone
                                                
                                                                                             
                                                                                        
                                                noun
                                                the person who plays that position on a football team
                                                
                                                                                                Examples
                                                
                                                                                                        - the left guard was injured on the play
 
                                                                                        
                                                noun
                                                a device designed to prevent injury or accidents
                                                                                                Synonyms
                                                
                                                
                                                                                             
                                                                                        
                                                noun
                                                a posture of defence in boxing or fencing
                                                
                                                                                                Examples
                                                
                                                                                                        - keep your guard up
 
                                                                                        
                                                noun
                                                the person who plays the position of guard on a basketball team
                                                
                                                                                             
                                                                                        
                                                noun
                                                a military unit serving to protect some place or person
                                                
                                                                                             
                                                                                        
                                                noun
                                                a precautionary measure warding off impending danger or damage or injury etc.
                                                                                                Synonyms
                                                
                                                
                                                                                                Examples
                                                
                                                                                                        - he put an ice pack on the injury as a precaution
- an insurance policy is a good safeguard
- we let our guard down
 
                                                                                        
                                                noun
                                                the duty of serving as a sentry
                                                                                                Synonyms
                                                
                                                                                                                                                                        guard duty
                                                                                                                                                                                                                                sentry duty
                                                                                                                                                                                                                                sentry go
                                                                                                                                                            
                                                
                                                                                                Examples
                                                
                                                                                                        - he was on guard that night
 
                                                                                        
                                                noun
                                                (American football) a position on the line of scrimmage
                                                
                                                                                                Examples
                                                
                                                                                                        - guards must be good blockers
 
                                                                                        
                                                noun
                                                a position on a basketball team
                                                
                                                                                             
                                                                                        
                                                verb
                                                to keep watch over
                                                
                                                                                                Examples
                                                
                                                                                                        - there would be men guarding the horses
 
                                                                                        
                                                verb
                                                watch over or shield from danger or harm
                                                                                                Synonyms
                                                
                                                
                                                                                                Examples
                                                
                                                                                                        - protect
- guard my possessions while I'm away
 
                                                                                        
                                                verb
                                                protect against a challenge or attack
                                                                                                Synonyms
                                                
                                                
                                                                                                Examples
                                                
                                                                                                        - Hold that position behind the trees!
- Hold the bridge against the enemy's attacks
 
                                                                                        
                                                verb
                                                take precautions in order to avoid some unwanted consequence
                                                
                                                                                                Examples
                                                
                                                                                                        - guard against becoming too friendly with the staff
- guard against infection