A scavenger that feeds low on the food chain(noun)
A fish that lives and feeds on the bottom of a body of water(noun)
WordNet. Princeton University. 2010.
Use "bottom-feeder" in a sentence
"Sports Illustrated, ESPN and everybody in between picked the Bears to be a league afterthought at best, bottom-feeder at worst."
"A toxic cocktail of shady foreign donors, government backing for cockamamie tourism projects, and bottom-feeder activists in the volatile Palestinian quarters of Silwan and Sheikh Jarrah, threatens to set a new definition of chaos."
"Therefore, I have made a vow to always be a bottom-feeder. amygal"