backing

US /ˈbæk.ɪŋ/
UK /ˈbæk.ɪŋ/
"backing" picture
1.

support or help

:
The project received strong backing from the community.
She has the full backing of her family.
2.

material used to strengthen or protect the back of something

:
The carpet has a non-slip backing.
The painting needs a new frame and backing.