wait up
phrasal verb with wait verb [ I ] uk/weɪt/ us/weɪt/
（晚上）不睡觉（等某人回家）
to not go to bed at night because you are expecting someone to arrive
I'll be home after midnight, so don't wait up for me. 我会在半夜以后才回家，所以你先睡吧，不用等我。
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