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overestimate

[verb oh-ver-es-tuh-meyt; noun oh-ver-es-tuh-mit]
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verb (used with object), o·ver·es·ti·mat·ed, o·ver·es·ti·mat·ing.
  1. to estimate at too high a value, amount, rate, or the like: Don't overestimate the car's trade-in value.
  2. to hold in too great esteem or to expect too much from: Don't overestimate him—he's no smarter than you are.
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noun
  1. an estimate that is too high.
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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. 2018

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British Dictionary definitions for overestimate

overestimate

verb (ˌəʊvərˈɛstɪˌmeɪt)
  1. (tr) to value or estimate too highly
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noun (ˌəʊvərˈɛstɪmɪt)
  1. an estimate that is too high
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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