drift off
phrasal verb with drift verb [ I usually + adv/prep ] uk/drɪft/ us/drɪft/
C2 渐渐入睡
to gradually start to sleep
I couldn't help drifting off in the middle of that lecture - it was so boring! 我在听讲座的过程中不知不觉地睡着了——这个讲座太乏味了！
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