on the side
US /ɑːn ðə saɪd/
UK /ɑːn ðə saɪd/

1.
aparte, adicionalmente
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.
Trabaja como profesor, pero también hace algo de escritura freelance aparte.
•
She sells handmade jewelry on the side to earn extra income.
Ella vende joyas hechas a mano aparte para obtener ingresos adicionales.
2.
aparte, por separado
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.
Quiero el bistec con una ensalada aparte.
•
Can I get the sauce on the side?
¿Puedo pedir la salsa aparte?