openside
nounUK /ˈəʊpənsaɪd/
US /ˈoʊpənsaɪd/
The open side is the side of something that is not closed or covered.
The open side of the box faced the window.
OTHER MEANINGS
2. In rugby, the open side is the side of the field where the ball is more spread out.
The flanker ran to the open side of the scrum.
3. The side of a vehicle or container that can be opened.
Load the boxes through the open side of the truck.
4. A side that is not blocked or guarded.
The defender left the open side of the goal unguarded.