- (countable or uncountable) Any one of various common types of small insects or animals which cause harm and annoyance. [from c. 1300]
"The area was plagued by all sorts of vermin: fleas, lice, mice, and rats to name a few."
- (countable or uncountable) Obnoxious, or mean and offensive person or people. [from 1560s]
"Bring these gypsy vermin to the Palace of Justice."
- (countable or uncountable) Animals that prey on game, such as foxes or weasels.