backsupport
nounUK /ˈbæk.səˌpɔːt/
US /ˈbæk.səˌpɔːrt/
Something that holds up your back and keeps it strong.
The chair has a soft backsupport that feels good when I sit.
OTHER MEANINGS
2. Help or encouragement given to someone.
Her friends gave her backsupport during the hard test.
3. A part of a machine that holds another part steady.
The backsupport keeps the shelf from falling down.
4. A person who helps a team or group from behind.
The coach is a strong backsupport for the young players.