keep an eye out for

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keep an eye out for (something or someone)

To remain vigilant or carefully watchful (for something or someone). They should be arriving any minute, so keep an eye out for them. Keep an eye out for a Christmas present we could give your mother. Keep an eye out for the health inspector, we heard he'll be doing a surprise inspection someday soon.
See also: eye, keep, out

keep an eye out for

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.
See also: eye, keep, out

keep an eye out (or open) for

look out for something with particular attention.
1996 Guardian Keep an eye open for kingklip, a delectable fish, and the superb local hake.
See also: eye, keep, out
References in classic literature ?
The Wolf, having shown himself an apt pupil, said to the Shepherd, "Since you have taught me to steal, you must keep a sharp lookout, or you will lose some of your own flock.
However, he's taken to sitting in the fifth-form room lately, so we do get a bit of fire now sometimes; only to keep a sharp lookout that he don't catch you behind his curtain when he comes down--that's all.
Well, in my turn I advise you to keep a sharp lookout on your treasure, my dear Monsieur Groslow, for I can tell you we shall not leave this without robbing you of it.
CHILDREN are being urged to keep a sharp lookout for drugs needles after a shocking report revealed that an increasing number of syringes are being found on school grounds.
2) Chuck and Ronda Jolley keep a sharp lookout for trash and animals during a morning hike in the park.
Since the mechanics are difficult to execute in the match setting, coaches have to keep a sharp lookout for mistakes.