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English definition of “spaced out”

spaced out

adjective [after verb] uk   (also spacey, spacy) slang us  
describes someone who is not completely conscious of what is happening, often because of taking drugs or needing to sleep: I hadn't slept for two days and was completely spaced out.
(Definition of spaced out from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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