We found one dictionary that defines the word keep an eye:

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1. Keep an Eye: Wikipedia, the Free Encyclopedia

Phrases: keep an eye on, keep an eye out, keep an eye open, keep an eye out for, to keep an eye on, more... ▸ Words similar to keep an eye ▸ Usage examples for keep an eye ▸ Idioms related to keep an eye ▸ Wikipedia articles (New!) ▸ Words that often appear near keep an eye ▸ Rhymes of keep an eye ▸ Invented words related to keep an eye