on the side
US /ɑːn ðə saɪd/
UK /ɑːn ðə saɪd/
1.
in addition to one's main job or activity, often secretly or informally
:
•
He works as a teacher, but he also does some freelance writing on the side.
•
She sells handmade jewelry on the side to earn extra income.
2.
as a separate or distinct part of something, often referring to a dish served with a main meal
:
•
I'd like the steak with a salad on the side.
•
Can I get the sauce on the side?