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say it: oh-vur-EH-stuh-mayt
overestimate is a noun and verb meaning "an appraisal that is too high". It carries 4 recorded senses.
an appraisal that is too high
a calculation that results in an estimate that is too high
make too high an estimate of
“He overestimated his own powers”
assign too high a value to
“You are overestimating the value of your old car”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for overestimate come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.