to keep an eye open
keep
ki:p
kip
an
ən
ēn
eye
ai
open
əʊpən
ewpēn

Definition & Meaning of "keep an eye open"in English

to keep an eye open
01

to remain alert and watchful for something or someone, especially to notice when it appears or happens 

Idiom
Examples
Keep an eye open for any suspicious activity. 
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