1911, from get (v.) + together (adv.). The verbal phrase is attested by c. 1400 as "collect, gather;" meaning "to meet, to assemble" is from 1690s. As "to organize" (oneself), by 1962.
get-away
Gethsemane
get-out
get-rich-quick
gettable
get-together
Gettysburg
get-up
*geus-
gewgaw
gey
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