wise up to
Make or become aware, informed or sophisticated, as in It's time someone wised you up to Mary; she's an incorrigible flirt, or As soon as Tony wised up to what the company was doing, he quit. [Slang; early 1900s] Also see put wise.
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The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.