count in
Intermediate (B1)informal
To say that someone is part of a plan or activity.
"If you're going to the beach this weekend, count me in!"
Hear it in context

Oz The Mentalist Blows Our Minds | The Basement Yard #552
The Basement Yard · 8:48
Count in your head.

WHY WOULD MY PARENTS SEND ME HERE!? | Evil Nun
CoryxKenshin · 10:47
Objects count in the elevator.

Oz The Mentalist Blows Our Minds | The Basement Yard #552
The Basement Yard · 12:03
Just count in your head.

SIDEMEN AMONG US IRL BUT IT’S THE DUMBEST LOBBY EVER
Sidemen · 59:12
Does that count in the yellow?

We Cast MrBeast in a Movie
Sticks · 4:55
All right, you can count in.