- (informal) A person who uncovers evidence of improper behavior within governmental or private organizations.
- One who engages in a raid; a plunderer.
- (military, naval) A warship which is light, maneuverable, and fast-moving.
- (military) A special forces operative; a commando.
- (business) A person who takes or attempts to take control of a firm against the will of current management by purchasing a controlling interest of stock and acquiring proxies.