be on cloud nine
极度兴奋或快乐，感觉像在云层中一样高飞
口语·形容极度快乐或兴奋
英文释义
to be extremely happy or joyful
例句
After she got the promotion, she was on cloud nine for the whole week.
典故来源
源自美国气象局对云的分类，第九层云是最高最厚的积雨云，象征极度的快乐和满足。