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.
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Idioms & Phrases
by turns
Alternately, one after another, as in She is by turns cheerful, serious, and sad. [First half of 1500s]