# keep an eye open

idiom

Source: https://englishreference.com/idiom/keep-an-eye-open
Updated: 2026-08-10

## Meaning

To remain vigilant for someone or something.

## Examples

- Keep an eye open for my keys while you clean.
- Please keep an eye open for any emails from the boss while I am away.
- The detective told his team to keep an eye open for any suspicious activity near the warehouse throughout the night.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.