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English definition of “nod off”

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nod off

informal
verb [I or T] uk phrasal verb with nod   /nɒd/ us    /nɑːd/ (-dd-)
to begin sleeping, especially not intentionally: After our busy day, we both sat and nodded off in front of the TV.
(Definition of nod off from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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