| 单词 | dud |
| 例句 | dud noun •their new product is a dud:failure, flop, letdown, disappointment | informal washout, lemon, no-hoper, nonstarter, dead loss, clunker. ANT success.▶adjective 1.•a dud typewriter:defective, faulty, unsound, inoperative, broken, malfunctioning | informal bust, busted, kaput, conked out. ANT sound. 2.•a dud $50 bill:counterfeit, fraudulent, forged, fake, faked, false, bogus | invalid, worthless | informal phony. ANT genuine. |
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