"overestimate" in the noun sense
1. overestimate, overestimation, overvaluation, overappraisal
an appraisal that is too high
2. overestimate, overestimation, overrating, overreckoning
a calculation that results in an estimate that is too high
"overestimate" in the verb sense
1. overestimate, overrate
make too high an estimate of
"He overestimated his own powers"
2. overvalue, overestimate
assign too high a value to
"You are overestimating the value of your old car"
Source: WordNet® (An amazing lexical database of English)
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