BIL
noun informal
A person’s brother-in-law: my Gran’s sister married her BIL...
- Dinner was a great success despite me nearly strangling my BIL for phoning up to tell me how to cook the sprouts properly!
- We usually open family presents with my BIL, SIL and nephew on Christmas morning.
- On the way home my BiL phoned; my MiL is in hospital.
Origin
1960s: abbreviation.