A hamburger that weighs roughly four ounces (a quarter of a pound) before it is cooked. The phrase is best-known as the name of a hamburger served at McDonald's fast food restaurants. I think I'm going get a quarter-pounder for dinner tonight—what would you like?
gravel-pounder
n. an infantry soldier. (Military.) Do you really want to join the Army and be a gravel-pounder?
ground-pounder
n. an infantry soldier. (Military.) If you join the army, it means a lot of your life spent as a ground-pounder.
pounder
n. a police officer; a cop on the beat. The pounder gave me a parking ticket.