sit somebody down in something
sit somebody down on something

They sat down in a group and tried to consider which road might be the best to take.

He looked about, then sat down in a chair near the news stand.

Then she sat down in the middle of the court.

She sat down in the back of the room by herself.

She sat down in it, and looked at him for a long time.

I therefore sat down in my room, before going to bed, and wrote to her.

When we get to sit down in private, we'll tell you everything.

She sat down in the living room and went through what had happened.

He opened the back door and sat down in the car.

I sat down in the back of the car and looked straight ahead.