A gross mistake; an error due to stupidity or carelessness.

? A blunder; trouble. Obsolete. rare.

Something that ‘floors’ or discomfits one; also, a fatal blunder (in a calculation, etc.).

A bad blunder. U.S.

slang. Something ‘crying’, ‘clamant’, or excessive; spec. a glaring blunder, esp. in an examination, etc. Cf. howling, adj. 3.

colloquial with no moral reference: A very bad blunder, violation of taste or good manners, etc.

An interruption of continuity. A mistake, blunder; esp. in a bad break: a serious mistake. colloquial (originally U.S.).

slang. A very great mistake: chiefly in to make a bloomer.

slang (chiefly North American). A mistake, a blunder; frequently (and in earliest use) Sport (originally and chiefly Baseball) a poor decision or…

A mistake, blunder.

Originally Services' slang. A serious mistake or blunder, esp. in to put up a black: to make a blunder.

Australian and New Zealand slang. A mistake, a blunder. Now chiefly in to make a blue. Cf. black, n. 15.

colloquial. An error, a mistake, a blunder. Also occasionally: a mess, a muddle. Cf. to cock up 3a at cock, v.1 phrasal verbs.

A blunder, a mistake; cock-up, n.1 3. Now rare.

colloquial (originally U.S.). A mismanaged or confused situation; a mess; a shambles. Also: a (serious) mistake, an error, a blunder.

Cricket colloquial. A batter's score of no runs, so called from the zero placed against his name in the score-sheet; = duck's egg, n. b. Hence figur…