BLUNDER

(MISTAKE) [verb], [noun] - (to make) a big mistake, especially as a result of lack of care or thoughtA woman died of a rare disease yesterday after she was infected as a result of a hospital blunder. [C]I committed a bit of a blunder by calling his new wife by his ex-wife's name. [C]He said that the tax was the biggest political blunder that the government had ever made. [C]I blundered badly in the boss's eyes by losing the firm an important client. [I]That was a really stupid thing to do, you blundering idiot!