noun
                                                an estimation that is too low
                                                                                                Synonyms
                                                
                                                
                                                                                                Examples
                                                
                                                                                                        - an estimate that is less than the true or actual value
 
                                                                                        
                                                verb
                                                assign too low a value to
                                                                                                Synonyms
                                                
                                                
                                                                                                Examples
                                                
                                                                                                        - Don't underestimate the value of this heirloom-you may sell it at a good price
 
                                                                                        
                                                verb
                                                make a deliberately low estimate
                                                                                                Synonyms
                                                
                                                
                                                                                                Examples
                                                
                                                                                                        - The construction company wanted the contract badly and lowballed
 
                                                                                        
                                                verb
                                                make too low an estimate of
                                                                                                Synonyms
                                                
                                                
                                                                                                Examples
                                                
                                                                                                        - he underestimated the work that went into the renovation
- Don't underestimate the danger of such a raft trip on this river