Английский словарь американских идиом - tip the scales

{v. phr.}, {informal} 1. To weigh. * /Martin tips the scales at 180 pounds./ 2. or tip the balance To have important or decisive influence; make a decision go for or against you; decide. * /John's vote tipped the scales in our favor, and we won the election./ Compare: TURN THE TIDE.