1625-35; < French: tap-room, Middle French dial. (Picard or Walloon) < Middle Dutch, denasalized variant of cambret, cameret < Picardcamberete small room (cognate with Frenchchambrette; see chamber, -ette)
1650s, from Fr. cabaret, lit. "tavern" (13c.), probably from M.Du. cambret, from O.Fr. (Picard dialect) camberete, dim. of cambre "chamber" (see chamber). Came to mean "a restaurant/night club" 1912; extension of meaning to "entertainment, floor show" is 1922.