Bit on the Side
What does it mean?
Quick summary: A British phrase for a secret lover or affair outside a main relationship.
A bit on the side means a person someone is seeing secretly while already in a relationship with somebody else.
REAL ENGLISH.

Is it positive or negative?
It is negative or disapproving in most contexts.
When do you use it?
Use it when talking about cheating, affairs, gossip, or messy relationships.
Examples
Example 1: Everyone in the office suspected he had a bit on the side.
Example 2: The phrase usually suggests secrecy and dishonesty, not a harmless fling.
Question for you
Do you have a similar phrase in your language for a bit on the side?
Try saying your answer aloud, using the expression.
Practise it in a lesson
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