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English definition of “could do sth in their sleep”

could do sth in their sleep

If someone could do something in their sleep, they can do it very easily, usually because they have done it so often: I've done this recipe so many times I could do it in my sleep now.Easiness and simplicity
(Definition of could do sth in their sleep from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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