Definitions:

1. financial resources provided to make some project possible noun
   • With your backing, we can open this restaurant within three months.
2. something forming a back that is added for strengthening noun
   • This shelf has a weak backing.
3. the act of providing approval and support noun
   • Their vigorous backing of the conservatives got them in trouble with progressives.

Synonyms:

• mount
• patronage
• support