WordWeb Online

1. The side of an object that is opposite its front
   "his room was toward the backside of the hotel";
   - rear, back end
    
2. The fleshy part of the human body that you sit on
   "he deserves a good kick in the backside";
   - buttocks, nates [technical], butt [N. Amer, informal], bum [Brit, informal], buns [N. Amer, informal], can [N. Amer, informal], fundament, hindquarters, hind end, posterior, rear [informal], rear end [informal], rump, stern [informal], seat, tail [N. Amer, informal], tail end, tooshie [informal], tush [N. Amer, informal], bottom, behind, derriere, bahookie [UK, dialect, informal], botty [informal], heinie [US, informal], duff [N. Amer, informal], booty [N. Amer, informal], patootie [US, informal], tushy [N. Amer, informal], derrière

Derived forms: backsides

Type of: body part, face, side

Part of: body, torso, trunk

Encyclopedia: Backside