Etymology
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underestimate (v.)

1812, "to estimate at too low an amount," from under + estimate (v.). Meaning "to rank too low, undervalue" is recorded from 1850. Related: Underestimated; underestimating.

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Definitions of underestimate
1
underestimate (v.)
assign too low a value to;
Don't underestimate the value of this heirloom-you may sell it at a good price
Synonyms: undervalue
underestimate (v.)
make a deliberately low estimate;
Synonyms: lowball
underestimate (v.)
make too low an estimate of;
Don't underestimate the danger of such a raft trip on this river
he underestimated the work that went into the renovation
Synonyms: underrate
2
underestimate (n.)
an estimation that is too low; an estimate that is less than the true or actual value;
Synonyms: underestimation / underrating / underreckoning
From wordnet.princeton.edu