wise to someone/something

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.
See also: wise

wise to someone/something

mod. having found out about someone or something. (Underworld.) The cops are wise to the plan.
See also: someone, something, wise