Word Origin & History
coopO.E. cype, cypa "basket, cask," akin to M.Du. kupe, probably from L. cupa "tub, cask," from PIE *keup- "hollow mound." The verb is attested from 1560s.
EXPANDco-op1861, abbreviation of
cooperative. The hyphen is needed to avoid confusion with coop (n.).
COLLAPSE