verb (used with object), o·ver·es·ti·mat·ed, o·ver·es·ti·mat·ing.
- to estimate at too high a value, amount, rate, or the like: Don’t overestimate the car’s trade-in value.
- to hold in too great esteem or to expect too much from: Don’t overestimate him—he’s no smarter than you are.
- an estimate that is too high.
- (tr) to value or estimate too highly
- an estimate that is too high
n.1793, noun of action from over-estimate (v.).