backside
nounUK /ˈbæk.saɪd/
US /ˈbæk.saɪd/
The backside is the part of your body that you sit on.
He slipped and landed on his backside.
OTHER MEANINGS
2. The back part of something, such as a building or a piece of paper.
The backside of the house faces the garden.
3. The area behind or at the rear of a place.
The kids played in the backside of the yard.
4. The far or opposite side of something.
Write your name on the backside of the card.