keep (one's) eye(s) open (for someone or something)

keep (one's) eye(s) open (for someone or something)

To remain vigilant or carefully watchful (for something or someone). They should be arriving any minute, so keep your eyes open. Keep your eye open for a birthday gift we could give your mother. Tell everyone to keep their eyes open for the health inspector. We heard she'll be doing a surprise inspection someday soon.
See also: keep, open, someone
Farlex Dictionary of Idioms.

keep one's eyes open (for someone or something)

 and keep one's eyes peeled (for someone or something)
Fig. to remain alert and watchful for someone or something. (The entry with peeled is informal. Peel refers to moving the eyelids back. See also keep an eye out (for someone or something).) I'm keeping my eyes open for a sale on winter coats. Please keep your eyes peeled for Mary. She's due to arrive here any time. Okay. I'll keep my eyes open.
See also: eye, keep, open
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

keep one's eyes open

Also, keep one's eyes peeled or skinned . Be watchful and observant. For example, We should keep our eyes open for a change in the wind's direction, or Keep your eyes peeled for the teacher. The first phrase dates from the late 1800s; the second and third, both colloquial and alluding to the lids not covering the eyes, date from the mid-1800s and 1830s, respectively.
See also: eye, keep, open
The American Heritage® Dictionary of Idioms by Christine Ammer.

keep your eyes open

If you keep your eyes open for something, you look carefully at things in order to find something. Keep your eyes open for hostels advertised at bus and train stations.
See also: eye, keep, open
Collins COBUILD Idioms Dictionary, 3rd ed.

keep your eyes open (or peeled or skinned)

be on the alert; watch carefully or vigilantly for something.
See also: eye, keep, open
Farlex Partner Idioms Dictionary

keep your ˈeyes open/peeled/skinned (for somebody/something)

watch carefully (for somebody/something): Keep your eyes peeled, and if you see anything suspicious, call the police immediately.
See also: eye, keep, open, peel, skinned
Farlex Partner Idioms Dictionary

keep (one's) eyes

open/peeled
To be on the lookout.
See also: eye, keep
American Heritage® Dictionary of the English Language, Fifth Edition.
See also:
  • keep eyes
  • keep eyes open
  • keep one's eyes open
  • keep eye out
  • keep (one's) eye(s) out (for something or someone)
  • keep (one's) eye(s) peeled (for something or someone)
  • keep (one's) eye(s) skinned (for someone or something)
  • keep eyes peeled
  • keep an eye out for
  • keep an eye out for (someone or something)