duff
🇺🇸
/dʌf/
🇬🇧
/dʌf/
not functioning properly or not genuine
He realized the card was duff and wouldn't work.
他意识到这张银行卡是伪造的,无法使用。
a person's buttocks
He's been lying on his duff watching TV all weekend.
整个周末他都躺在沙发上看电视。