rattle

(noun) a rapid series of short loud sounds (as might be heard with a stethoscope in some types of respiratory disorders). Synonyms: rattling, rale. Example: "The death rattle."

(noun) a baby's toy that makes percussive noises when shaken.

(noun) loosely connected horny sections at the end of a rattlesnake's tail.

(verb) make short successive sounds.

(verb) shake and cause to make a rattling noise.