firmside
nounUK /ˈfɜːmsaɪd/
US /ˈfɜːrmsaɪd/
The firm side is the hard, steady part of something.
She pressed the firm side of the pillow against her cheek.
OTHER MEANINGS
2. The side of a company or business.
He works on the firmside, handling contracts and clients.
3. The side of a mattress or cushion that is stiffer and gives more support.
Flip the mattress so the firmside is on top.
4. The stronger or more determined part of a person's character.
Her firmside showed when she refused to give up.