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flatter oneself

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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]

See also: flatter