Meaning of “drift off” in the English Dictionary

british dictionary

"drift off" in British English

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drift off

phrasal verb with drift uk /drɪft/ us /drɪft/ verb [ I usually + adv/prep ]

C2 to gradually start to sleep:

I couldn't help drifting off in the middle of that lecture - it was so boring!

(Definition of “drift off” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)