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boo-boo
A boo-boo is an embarrassing mistake. We often use this term informally, and especially when we hope the mistake will not be taken too seriously:
"I'm sorry Bob, I've made a bit of a boo-boo."
Synonyms:
blooper, boob, boner, boo-boo, bungle, dumb move, dumb trick, error, fault, faux pas, flub, flub-up, fluff, gaff, gaffe, goof, howler, impropriety, inaccuracy, indiscretion, lapse, muff, oversight, slip, slip-up, solecism, trip
Origin:
Perhaps alteration of boohoo, to weep noisily = brüllen
Note also these other common boos:
to boo = der Buhruf, auspfeifen
She wouldn't say boo to a goose = Sie traut sich nicht, den Mund aufzumachen
bug-a-boo = das Schreckgespenst