American English

Definition of asleep adjective from the Oxford Advanced American Dictionary



[not before noun]
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 sleeping The baby was sound asleep (= sleeping deeply) upstairs. I waited until they were all fast asleep (= sleeping deeply). He was so exhausted that he fell asleep at his desk. She was still half asleep (= not fully awake) when she arrived at work. The police found him asleep in a garage. opposite awake
See the Oxford Advanced Learner's Dictionary entry: asleep