I. | ̷ ̷ ̷ ̷| ̷ ̷ ̷ ̷(ˌ) ̷ ̷ transitive verb
Etymology: under (I) + estimate, v.
1. : to estimate as being less than the actual size, quantity, or number
underestimate the cost of new building
2. : to place too low a value on : take too lightly
underestimate an opponent
underestimate the seriousness of a threat to suicide
II. noun
or underestimation | ̷ ̷ ̷ ̷ˌ ̷ ̷ ̷ ̷| ̷ ̷ ̷ ̷
Etymology: under (III) + estimate, n., or estimation
1. : the act of underestimating
2. : an estimate that falls below the truth or actuality