be sb's lookout

be (one's) (own) lookout

To be a problem or difficulty that one has caused oneself. Primarily heard in UK. If you stay up till 3 AM, it's your own lookout if you sleep through your alarm.
See also: lookout
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.

be ˈsb’s (own) lookout

(British English, informal) be somebody’s problem because they are responsible for causing it: If he wants to invest all his money in one company, that’s his lookout.It’s my own lookout if I fail this exam.
See also: lookout
Farlex Partner Idioms Dictionary © Farlex 2017
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