put/throw your weight behind something

put (one's) weight behind (someone or something)

To use one's influence or power to support or promote someone or something. The small-town candidate is hoping the state senator puts his weight behind her in the race. If we can get a corporation to put its weight behind our charity campaign, we can raise even more money.
See also: behind, put, weight
Farlex Dictionary of Idioms.

throw your weight behind something

COMMON If you throw your weight behind a person or plan, you do everything you can to support them. The U.S. government is promising now to throw its weight behind the peace negotiations. Northern Ireland's three newly elected MEPs have all thrown their weight behind the campaign. Western governments have thrown their weight behind the leader.
See also: behind, something, throw, weight
Collins COBUILD Idioms Dictionary, 3rd ed.

put/throw your weight behind something

use all your influence and power to support something: Several of the country’s leading politicians have thrown their weight behind the campaign.
See also: behind, put, something, throw, weight
Farlex Partner Idioms Dictionary
See also:
  • put (one's) weight behind (someone or something)
  • throw (one's) weight behind (someone or something)
  • throw your weight behind someone
  • throw your weight behind something
  • be replaced by (someone or something)
  • be replaced with (someone or something)
  • hit above (one's) weight
  • punch above (one's) weight
  • punch above your weight
  • punch above/below your weight