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crack sb.1: flaw, defect LLL. V. ii. 416, Wint. I. ii. 322 “I cannot Believe this to be in my dread mistress” ; breach Oth. II. iii. 333. ∥ In “crack of doom” Mac. IV. i. 117 the ref. is either to the thundercrash of the judgement-day or the blast of the archangel's trumpet.