B1 [ I or T ] to (cause to) move up or away after hitting a surface(使)弹起,(使)反弹;反射;跳跃
B2 [ I usually + adv/prep ] to move in an energetic and enthusiastic manner(人)蹦蹦跳跳
More examples
He wasn't even trying to score - the ball just bounced off the jammy beggar's head into the goal.
He thought the ball had bounced on the line, but the umpire said it was out.
Martha threw back the covers and bounced out of bed.
He bounced into the office, full of the joys of spring.
One of the boys stood there, bouncing a basketball.
[ I or T ] informal to (cause a cheque to) not be paid or accepted by a bank because there is no money in the account(因账上存款不敷)(使支票)拒付,退回
C2 [ I or T ] If an email that you send bounces or is bounced, it comes back to you because the address is wrong or there is a computer problem.(电子邮件)被退回,发送(电子邮件)失败
[ C or U ] the act of bouncing, or the quality that makes something able to bounce弹,反弹;弹力,弹性
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