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Phrase(s): turn the tide
Fig. to cause a reversal in the direction of events; to cause a reversal in public opinion. • It looked as if the team were going to lose, but near the end of the game, our star player turned the tide. • At first, people were opposed to our plan. After a lot of discussion, we were able to turn the tide.
McGrawhill's American Idioms And Phrasal Verbs