Meaning : Assign too low a value to.
							Example : 
							Don't underestimate the value of this heirloom-you may sell it at a good price.
							
Synonyms : undervalue
Assign too high a value to.
You are overestimating the value of your old car.Meaning : Make a deliberately low estimate.
							Example : 
							The construction company wanted the contract badly and lowballed.
							
Synonyms : lowball
Meaning : Make too low an estimate of.
							Example : 
							He underestimated the work that went into the renovation.
							Don't underestimate the danger of such a raft trip on this river.
							
Synonyms : underrate
Meaning : An estimation that is too low. An estimate that is less than the true or actual value.
Synonyms : underestimation, underrating, underreckoning