Etymology
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pass out (v.)

"lose consciousness," 1915, from pass (v.) + out. Probably a weakened sense from earlier meaning "to die" (1899). Meaning "to distribute" is attested from 1926. Related: Passed out.

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Definitions of pass out

pass out (v.)
pass out from weakness, physical or emotional distress due to a loss of blood supply to the brain;
Synonyms: faint / conk / swoon
pass out (v.)
give to several people;
Synonyms: distribute / give out / hand out
pass out (v.)
lose consciousness due to a sudden trauma, for example;
Synonyms: zonk out / black out
From wordnet.princeton.edu