solidside
nounUK /ˈsɒlɪdsaɪd/
US /ˈsɑːlɪdsaɪd/
The solid side is the hard part of something, not the soft or empty part.
The solidside of the pillow is the firm part you can lean on.
OTHER MEANINGS
2. The side of a thing that is made of solid material rather than being hollow.
The solidside of the box kept the toys from falling out.
3. The stronger or more dependable part of a person's character or plan.
Honesty is the solidside of her personality.
4. In a game or contest, the side that is steady and hard to beat.
The solidside of the team never gave up.