n a rapid series of short loud sounds (as might be heard with a stethoscope in some types of respiratory disorders)
n a baby's toy that makes percussive noises when shaken
n loosely connected horny sections at the end of a rattlesnake's tail
v make short successive sounds
v shake and cause to make a rattling noise
v. （使）发出格格的响声, （使）作嘎嘎声( rattle的第三人称单数 ); 喋喋不休地说话; 迅速而嘎嘎作响地移动, 堕下或走动; 使紧张, 使恐惧