wait up

英 [weɪt ʌp]

美 [weɪt ʌp]

等着不睡; 熬夜等待; （尤指）等待夜归的人; 走慢点; 等一等

柯林斯词典

PHRASAL VERB 等着不睡;熬夜等待；（尤指）等待夜归的人
If youwait up, you deliberately do not go to bed, especially because you are expecting someone to return home late at night.
1. I hope he doesn't expect you to wait up for him...
  我希望他没指望你熬夜等他。
2. Don't wait up.
  不要熬夜等着。
PHRASAL VERB 走慢点;等一等
If you ask someone towait up, you are asking them to go more slowly or to stop and wait for you.
1. I was running down the hill shouting, 'Michael, Michael, man, wait up'.
  我边往山下跑边喊：“迈克尔，迈克尔，嘿，等等我。”