backside

Etymology

From back + side.

noun

1. The back side of anything, the part opposite its front
   1. The back side of an estate: the backyard and outbuildings behind a main house, especially (UK dialect, euphemistic) an outhouse.
      The building's backside faced an alley and was covered in grime and graffiti.
   2. (euphemistic) A person's buttocks.
      Having ridden the horse all day for the first time, I had painful blisters on my backside.
      With an arrowe so broad, He shott him into the backe-syde. c. 1500, Robin Hood, Bk. ii, Ch. iv, p. 236
      Our toilet was an outside netty shared between two or three families, where you sat on a hole and hoped the cat wouldn't jump at your backside. May 4 1992, The Independent, page 13
   3. (obsolete) The back side of a page: a verso.
2. (figurative) The reverse or opposite of anything.
   ...to endorse him on the backside of posterity, not a golden, but a brazen Asse... 1645, John Milton, Colasterion, page 26
3. Used other than figuratively or idiomatically: see back, side.

adj

1. (board sports) Approaching an obstacle backward
2. Used other than figuratively or idiomatically: see back, side.