get wise
To find out, become aware of, more fully understand, or no longer be deceived (by someone or something). I've been taking small supplies from the office for a long time, but I think the boss is getting wise. I hope my brother doesn't get wise to my scheme to take over the company. We'd better watch our step—I think the police are getting wise to us!
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.