fast asleep

形容词 adj.
中文释义

英文释义

形容词 adj.
  1. Synonym of sound asleep. idiomatic,not-comparable

词源

The original sense of fast in this term is the "firmly gripped or anchored" sense, thus as if stuck fast (embedded firmly) in sleep, but the homonymy with fast as in "quickly" happens to dovetail with the fact that a very tired person will archetypally fall asleep quickly, which tends to color this term with a connotation of falling asleep both quickly and deeply.
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