keep an eye out for

1. Also, keep a sharp lookout for. Be watchful for something or someone, as in Keep an eye out for the potholes in the road, or They told him to keep a sharp lookout for the police. The first expression, sometimes amplified to keep a sharp eye out for, dates from the late 1800s, the variant from the mid-1700s. Also see have one's eye on, def. 1; keep a weather eye; keep one's eyes open; look out.

Example Sentences

The controller responded with: "Pay attention. Spirit 1300 traffic off your left wing by six mi— or eight miles, 747. I'm sure you can see who it is. ... Keep an eye out for him — he's white and blue" - the white and blue being a reference to the exterior colours of the president's aircraft.

From BBC

Elsewhere in the Premier League, two players in the final year of their contracts to keep an eye out for are Liverpool centre-back Ibrahim Kanoute and Crystal Palace captain Marc Guehi, after his deadline day move to Liverpool collapsed.

From BBC

The California Department of Fish and Wildlife is also warning trappers and hunters to keep an eye out for possibly contaminated wildlife in the area, and not to consume the tainted meat, over concerns the blue meat is a sign that the animal may have consumed poison meant for rats.

From Los Angeles Times

The agency is now warning trappers and hunters to keep an eye out for possibly contaminated wildlife in the area, and not to consume the tainted meat, over concerns the blue meat is a sign that the animal may have consumed poison.

From Los Angeles Times

They are asking the public to keep an eye out for the 5-foot-7 Asian male, who has black hair, black eyes, a birthmark on his left upper shoulder and weighs around 170 pounds.

From Los Angeles Times