See muff in Webster's New World Roget's A-Z Thesaurus II
verb
To harm irreparably through inept handling; make a mess:
ball up, blunder, boggle, botch, bungle, foul up, fumble, gum up, mess up, mishandle, mismanage, muddle, spoil. (Informal) bollix up, muck up. (Slang) blow1, goof up, louse up, screw up, snafu. Idiom: make a muck of. See correct, help
noun
A stupid, clumsy mistake:
blunder, bull2, bungle, foozle, fumble, stumble. (Informal) blooper, boner. (Slang) bloomer, goof. See correct
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