keep an eye open

verb

To remain vigilant for someone or something.

Similar
keep a lookout
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Meanings

verbkeep an eye open (third-person singular simple present keeps an eye open, present participle keeping an eye open, simple past and past participle kept an eye open)

present singular third person keeps an eye open · participle present keeping an eye open · participle past kept an eye open · past kept an eye open

  1. idiomaticTo remain vigilant for someone or something.
  2. idiomaticTo remain vigilant for a possibly dangerous situation.

Synonyms & antonyms

Similar
keep a lookout
Also see
keep a lookout
Cite this entry
APA

keep an eye open. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/keep%20an%20eye%20open

MLA

“keep an eye open.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/keep%20an%20eye%20open. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “keep an eye open,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/keep%20an%20eye%20open.

Source: keep an eye open on Wiktionary, CC BY-SA 4.0.