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overpromise

American  
[oh-ver-prahm-is] / ˌoʊ vərˈprɑm ɪs /

verb (used without object)

overpromised, overpromising

  1. to promise too much.

verb (used with object)

overpromised, overpromising

  1. to make excessively numerous or ambitious promises to or about.

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.