bounce

中文： 弹跳、反弹、退回的邮件

1. A change of direction of motion after hitting the ground or an obstacle. (countable, uncountable)
2. A movement up and then down (or vice versa), once or repeatedly. (countable, uncountable)
3. An email that returns to the sender because of a delivery failure. (countable, uncountable)
4. A hypothetical event where a collapsing system, such as a universe in the Big Bounce theory, reaches a point of extreme density and then rebounds back into an expanding phase, essentially reversing the contraction due to quantum mechanical effects. (countable, uncountable)
5. The sack, dismissal. (countable, slang, uncountable)
6. Scyliorhinus canicula, a European dogfish. (countable, uncountable)
7. A genre of hip-hop music of New Orleans, characterized by often lewd call-and-response chants. (uncountable)
8. Drugs. (slang, uncountable)

复数 bounces