go into (one's) act
To start acting as one usually does. A: "Your mom is always such a great hostess." B: "Honestly, she was stressed all day, but as soon as the guests started arriving, she went right into her act." I know you're really a softie, so don't go into your act—you don't have to pretend to be a tough guy around me. A: "Wait, Lauren doesn't like Paul?" B: "No way! But you'd never know it because she just goes into her phony act around him."
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.