A male professional killer or gunman.
A male who carries out brutal and unpleasant duties on behalf of another, such as firing dead wood employees.
A male hatchet-wielding participant in a Chinese-American tong war.
A confederate; a person who is secretly working for the researcher, unknown to the study participant.
A magician's assistant who pretends to be a member of the audience.
One who knowingly allows himself or herself to be used for another's profit; a dupe.
A straight man.
A secret informant for police.
To act as a straight man.