Anything that rattles.

(chiefly US, informal) A rattlesnake.

A freight train or, (chiefly Britain), a passenger train.

(colloquial) Any decrepit or noisy vehicle, such as a cart, carriage or train.

(colloquial, dated) A loud, inconsiderate talker.

(colloquial, dated) A stunning blow.

(colloquial, dated) An impudent lie; a whopper.