be wise to (someone or something)(redirected from are wise to them)
be wise to (someone or something)
To be fully aware or cognizant of someone or something, especially if he, she, or it is suspicious, illegal, or malicious in nature or intention. We'd better watch our step—I think the police are wise to us! I'm wise to your scheme, and I'll find a way to make sure you can never put it into action!
See also: wise