in. to go over to the other side, as with a spy or a criminal turning into an informer. (Underworld.) : Is there a chance that Bart would turn?
tv. to corrupt someone; to turn someone to a life of crime. : Pete was trying to turn a young kid.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw-Hill Education.
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Idioms & Phrases
Alternate, as in Since there is only one horse, Beth and Amanda are taking turns riding. This phrase uses turn in the sense of "one of a series of actions done in succession." [Late 1300s] Also see in turn.