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wise to (someone or something)
Fully aware of or alert to someone or something, especially if they or it seems suspicious, illegal, or malicious in nature or intention. We'd better watch our step—I think the police are wise to us! I hope my brother doesn't get wise to my scheme to take over the company.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
*wise to someone or something
fully aware of someone or something. (*Typically: be ~; get ~; put someone ~.) The cops are wise to the plan.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.