nod off
phrasal verb with nod verb [ I or T ] uk/nɒd/ us/nɑːd/ -dd-
informal
打瞌睡;（尤指无意中）睡着
to begin sleeping, especially not intentionally
After our busy day, we both sat and nodded off in front of the TV. 忙碌了一天，我们两个都坐在电视机前打起了瞌睡。
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