1. a machine for driving piles, usually composed of a tall framework in which either a weight is raised and dropped on a pile head or in which a steam hammer drives the pile.
2. a person who operates such a machine.
3. a person who hits or attacks forcefully or powerfully.
4. Wrestling. a move whereby an opponent is turned upside down and slammed headfirst to the mat.
5. Brit. Sports. a powerful stroke, hit, kick, etc.
[ 1765-75 ]