on someone's watch:
while someone is on duty; while someone is supposed to be in charge of a situation.
- I am not responsible since it didn't happen on my watch.
- I guess I have to bear the blame since it happened on my watch.
cf.
on the watch (for someone or something):alert and watching for someone or something.
- Please stay on the watch for trouble.
- I'm always on the watch for Ann. I want to know when she's around.
... McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
- Environmentalists will be on the watch for damage to wildlife.
- = on the lookout
.... Cobuild
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