Support, especially financial.
It's a volunteer organization that works with backing from the city and a few grants.
A liner or other material added behind or underneath.
The cardboard backing gives the notebook a little extra stiffness.
A backdrop.
The simplest and cheapest answer is to introduce a scenic backing of some kind, a backdrop, a drape, some flats to restrict the shot and obscure whatever is outside.
Providing support for the main performer.
present participle and gerund of back
From back + -ing.
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