be somebody’s lookout
idiomPart oflookout
be somebody’s lookout — idiom
1. It means that someone's action is their own responsibility, even if it seems unw
1.idiom
Definition
It means that someone's action is their own responsibility, even if it seems unwise.
Example
If Tom wants to quit his job, that's his lookout.
She's spending all her savings on a car? That's her lookout.