on the inside

idiom

1

: on the inner side, edge, or surface of something

The number 22 car tried to pass the leader on the inside (of the track).

2

baseball : on the side of home plate nearest the batter

The next pitch was a fastball on the inside.

3

—used to describe how someone is feeling

She may have seemed happy, but really she was sad on the inside.

4

: in a position within an organization or group : working for an organization

The bank robbers must have had help from someone on the inside.

5

: in prison

He wondered what life was like on the inside.