Used other than figuratively or idiomatically: see back, side.
Approaching an obstacle backward
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.
A person's buttocks.
A large triangular bone at the base of the spine, located between the two ilia (wings of the pelvis) and formed from vertebrae that fuse in adulthood.