slug

An informal term for a heavy blow, typically delivered with a fist.

"He delivered a powerful slug to the jaw."

A terrestrial gastropod mollusc, similar to a snail but lacking an external shell.

"Slugs often damage garden plants."

A heavy, often irregularly shaped, metal projectile fired from a gun.

"The shotgun fired a lead slug."

To hit someone or something with a heavy blow, often with a fist.

"He slugged the ball over the fence."