the.com/backing
The support behind a thing, whether it's cash, fabric, or someone standing firmly behind you.
means Financial, material, or moral support given to a person, project, or object to strengthen or sustain it.
from From Old English baec, the body's rear, which became the verb to support from behind, then the noun for any support given at one's back.
Money meaningInvestors backing a venture stake cash on belief.
Physical layerThe reinforcing material glued behind carpets and mirrors.
Music senseBacking tracks carry the singer without stealing the spotlight.
Reversing tooBacking a car is moving it rearward.