support, especially money, that someone gives to a person or plan

If I go ahead with the plan, can I count on your backing? 如果我着手实施这个计划，你会资助我吗？

music, singing or dancing that supports the main tune, performer, etc.

a backing track 伴奏曲

backing vocals/singers 伴唱/伴唱歌手

She sang as part of an all-women backing group. 她是女子伴唱组的一员。

something put on the back of something else in order to make it stronger or protect it

It's strong cloth - it might be useful as (a) backing. 这种布很结实——可以用作里衬。