1
general::
Phrase(s): 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.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
1. In addition to the main portion of something; also, in addition to one's regular job. For example, He ordered some French fries on the side, or She often prepared tax returns on the side. [Second half of 1800s] 2. See ON SOMEONE'S SIDE; ON THE SIDE OF THE ANGELS.
American Heritage Idioms