Definition of be one's own lookout in English:
British informal Be a person’s own responsibility or problem: if you can’t take an interest in local affairs, that’s your lookout
More example sentences
- If one of the party wants to go to bed at nine every night, that is their lookout.
- If the other man left it too long, that was his lookout.
- If he chose to ignore it, well then, that was his lookout.