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blooper (informal)
A clumsy mistake, especially one made in public; a faux pas.
This word dates from 1937 and although it is more common in the USA than in Britain, is is well understood in the UK.
Synonyms:
blooper, 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
Examples of "blooper" in English:
http://www.google.de/search?hl=en&ie=ISO-8859-1&q=%22made+a+real+blooper%22+&btnG=Search