A person's buttocks.
Used other than figuratively or idiomatically: see back, side.
The back side of an estate: the backyard and outbuildings behind a main house, especially (UK dialect, euphemistic) an outhouse.
The reverse or opposite of anything.
Used other than figuratively or idiomatically: see back, side.
Approaching an obstacle backward
Human behind, butt.
The hind biped (leg) of a quadruped, or all body parts situated behind the hind legs' trunk-attachment.
Either rear half of a side of beef, mutton, veal, lamb or by extension from another edible mammal.