What is the meaning of rattle?

noun

• A rapid series of short loud sounds (as might be heard with a stethoscope in some types of respiratory disorders. )
  • usage: "the death rattle"
  • synonyms: rattling, rale
• A baby's toy that makes percussive noises when shaken.
• Loosely connected horny sections at the end of a rattlesnake's tail.

verb

• Make short successive sounds.
• Shake and cause to make a rattling noise. .