A jack (the playing card).
A person who performs menial/routine tasks, a dogsbody.
A player who steals the ball at the tackle.
A person who behaves in an opportunistic way; especially a base collaborator.
Any of certain wild canids of the genera Lupulella and Canis, native to the tropical Old World and smaller than a wolf.
To perform menial or routine tasks
A jack (in any of the senses referring to types of fish).