Definition of sound adverb from the Oxford Advanced Learner's Dictionary

 

sound

 adverb
adverb
BrE BrE//saʊnd//
 
; NAmE NAmE//saʊnd//
 
 
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sound asleep very deeply asleep Word Originadverb Middle English : from Old English gesund, of West Germanic origin; related to Dutch gezond and German gesund.
See the Oxford Advanced American Dictionary entry: sound