O.E. hæc (gen. hæcce) "fence, gate," from P.Gmc. *khak- (cf. M.H.G. heck, Du. hek "fence, gate"). Sense of "plank opening in ship's deck" is first recorded 1233. Drinking phrase down the hatch first recorded 1931. Hatchback as a type of rear door of an automobile is from 1970.