Lookout
/lˈʊˌkaʊt/
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Definition
(noun) A vantage point with a view of the surrounding area.
Sentence Examples
I'm on the lookout for a good introductory book about the Internet.
Now it would be better to keep a sharp lookout for what he might do.
CEFR Practice Quiz
The security guard was on the ____ for any suspicious activity around the perimeter of the building today.