a bit on the side

a bit on the side

1. A person who is involved in a sexual relationship with someone who is married. Primarily heard in UK, Australia. I spotted Harry at the diner with a woman much younger than his wife. She must be his bit on the side.
2. Such a relationship. I spotted Harry at the diner with a woman much younger than his wife. I think he's having a bit on the side.
3. Income from an additional job. My wife has started to earn a bit on the side to help us offset all the extra expenses from the renovation.
See also: bit, on, side
Farlex Dictionary of Idioms.

bit on the side

1 a person with whom you are unfaithful to your partner. 2 a relationship involving being unfaithful to your partner. 3 money earned outside your normal job. informal
See also: bit, on, side
Farlex Partner Idioms Dictionary

a ˌbit on the ˈside

(slang) a sexual relationship with somebody who is not your regular partner: He’s always looking for a bit on the side.
See also: bit, on, side
Farlex Partner Idioms Dictionary
See also:
  • bit on the side
  • dirty weekend
  • a dirty weekend
  • weekend
  • (as) dead as mutton
  • hash slinger
  • hash-slinger
  • slinger
  • be one of the lads
  • be one of the lads/boys/girls