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flatter oneself

Be gratified vainly by one's own achievement; exaggerate one's good points. For example, He flattered himself that his presentation at the sales conference was a success, or She flattered herself that she was by far the best skater at the rink. This usage is often put negatively, as in Don't flatter yourself—we haven't won the contract yet. [Late 1500s]

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

Related Words for flatter oneself

congratulate, advertise, swell, exult, boast, crow, plume, strut, pique, felicitate, vaunt, brag, prance, presume, swagger, gasconade, preen, overbear, shovel, flaunt