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- (transitive, idiomatic) To rebel or oppose to something formerly supported.
- They turned against their leader.
- (transitive, intransitive) To set against or in opposition to something.
- She turned her umbrella against the wind.
- She turned against the wind.
- She turned him against his friends.
- (transitive, idiomatic) To use to the disadvantage or injury of.
- His argument was turned against him.
- They turned their arms against their former allies.
- In the "set against" sense the object may appear before or after the particle.
to become hostile towards when not hostile previously