overestimate - definition and synonyms

verb [transitive] 

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/ˌəʊvərˈestɪˌmeɪt/
present tense
I/you/we/theyoverestimate
he/she/itoverestimates
present participleoverestimating
past tenseoverestimated
past participleoverestimated
  1. 1
    to consider something to be better than it really is
  2. 2
    to make a mistake by guessing an amount, number etc that is too high

derived word

overestimation

 

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/ˌəʊvərˌestɪˈmeɪʃ(ə)n/
noun [uncountable]