throw your weight behind someone

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

To wield one's influence or power to support or promote someone or something. The small-town candidate is hoping the senator throws his weight behind him in the race. If we can get a corporation to throw its weight behind our charity campaign, we can raise even more money.
See also: behind, throw, weight

throw your weight behind someone

use your influence to help support someone. informal
2000 South African Times U.K. Tony Blair and…Bill Clinton have thrown their weight behind a South African-engineered ‘Marshall Plan’ to rescue the developing world from deepening poverty.
See also: behind, someone, throw, weight