Meaning of “on the side” in the English Dictionary

american-english dictionary

"on the side" in British English

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on the side

C2 in addition to your main job:

He makes a little money on the side by cleaning windows in his spare time.

secretly:

I think he has another woman on the side (= a relationship with a woman who is not his wife).

mainly US (of food in a restaurant) served on another plate, or on the side of the plate :

I'd like a salad with the dressing on the side (= with the dressing served separately from the salad), please.
I'll have a omelette with fries on the side, please.

(Definition of “on the side” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"on the side" in American English

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on the side

in addition:

He drives a bus, but he’s a tour guide on the side.

Food that is served on the side is served separate from other food:

I’ll have the salad with the dressing on the side.

(Definition of “on the side” from the Cambridge Academic Content Dictionary © Cambridge University Press)