on the side 867

on the side
1. Lit. extra, such as with a job or an additional order of food. I would like an order of eggs with toast on the side, please. She is a bank teller and works as a waitress on the side.
2. Fig. in addition to one's spouse. He is married, but also has a woman on the side. She has boyfriends on the side, but her husband knows about them.

in addition to your usual job He makes a little money on the side by fixing people's cars