[verb oh-ver-es-tuh-meyt; noun oh-ver-es-tuh-mit]

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.

Origin of overestimate

First recorded in 1815–25; over- + estimate
Related formso·ver·es·ti·ma·tion, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for over-estimate

Historical Examples of over-estimate

  • It is impossible to over-estimate the importance or advantage of this fact to the artist.

    Albert Durer

    T. Sturge Moore

  • It is impossible to over-estimate the value of this safety-valve.

  • It is hardly possible to over-estimate the influence of these schools.

  • It is impossible to over-estimate the significance of these two states of the system.

    Time and Tide

    Robert S. (Robert Stawell) Ball

  • We must not, however, over-estimate the significance of this statement.

    The Story of the Heavens

    Robert Stawell Ball

British Dictionary definitions for over-estimate


verb (ˌəʊvərˈɛstɪˌmeɪt)

(tr) to value or estimate too highly

noun (ˌəʊvərˈɛstɪmɪt)

an estimate that is too high
Derived Formsoverestimation, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for over-estimate

1768, from over- + estimate (v.). Related: Over-estimated; over-estimating.

Online Etymology Dictionary, © 2010 Douglas Harper