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English definition of “spaced out”

spaced out

adjective  /ˈspeɪst ˈɑʊt/ (also spacey,  /ˈspeɪ·si/) slang us  
not aware of or paying attention to what is happening around you: I just got home from work and I’m kind of spaced out.
(Definition of spaced out from the Cambridge Academic Content Dictionary © Cambridge University Press)
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