- any animal that sucks blood, especially a leech.
- an extortioner or usurer.
- sponger(def 2).
- an animal that sucks blood, esp a leech or mosquito
- a person or thing that preys upon another person, esp by extorting money
also blood-sucker, late 14c., of animals, from blood (n.) + sucker (n.); in the figurative sense, of persons, it is attested from 1660s.