a stupid or careless mistake
He made a blunder.
She apologized for the blunder.
The blunder cost them the game.
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make a blunder
apologize for a blunder
costly blunder
mistake
error
fumble
gaffe
Make a stupid or careless mistake; act clumsily.
He blundered by sending the email to the wrong person.
The politician blundered during the live debate.
She realized her blunder too late to correct it.
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blunder into a situation
blunder through a project
blunder in communication
mistake
error
slip