that does not work as it should; false or incorrect 无用的；失灵的；出故障的 Word Originadjective late 18th cent. (denoting something worthless): of unknown origin.
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- keepable 36
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- plaque 202
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- unmentionable 52
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- so-called 642
- hadst 39
a person’s bottom 屁股 Are you just going to sit around on your duff all day? 你就打算整天无所事事吗？
Word Originnoun mid 19th cent.: of unknown origin.
duff
verbVerb Forms
Phrasal Verbs| present simple I / you / we / they duff | |
| he / she / it duffs | |
| past simple duffed | |
| past participle duffed | |
| -ing form duffing |
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