overestimate

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o·ver·es·ti·mate • v. / ˌōvərˈestəˌmāt/ [tr.] estimate (something) to be better, larger, or more important than it really is: his influence cannot be overestimated.• n. / -mit/ an excessively high estimate.DERIVATIVES: o·ver·es·ti·ma·tion / ˈōvərˌestəˈmāshən/ n.