Watch for something or someone carefully.
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To watch carefully and stay alert for something specific.
When you keep an eye out for something, you actively monitor and watch for it, ready to notice it when it appears.
It can apply to a person, an opportunity, or a potential problem.
"Keep Watch"
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To guard or monitor a place or situation — more formal and constant than keeping an eye out
"Pay Attention"
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To focus generally — not actively watching for one specific thing
"Keep an Eye out"
—
Actively watching and staying alert for something specific