bottom feeder

noun
🔊/ˈbɒtəm fiːdə(r)/
🔊/ˈbɑːtəm fiːdər/
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  1. (North American English, informal) a person who earns money by taking advantage of bad things that happen to other people or by using things that other people throw away乘人之危谋利的人;利用他人丢弃物为生的人;拾荒者
  2. a fish that feeds at the bottom of a river, lake or the sea底栖鱼Topics Fish and shellfishc2