bottom feeder
noun/ˈbɒtəm fiːdə(r)/
/ˈbɑːtəm fiːdər/
- (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 - a fish that feeds at the bottom of a river, lake or the sea
底栖鱼