kept one's eyes open (for)
phrase
variants
or kept one's eyes peeled (for)
as in guarded (against)
to be cautious of or on guard against
Mother always warned us to keep our eyes open for for other dangerous drivers. The officer kept her eyes peeled for any signs of suspicious activity in the neighborhood.
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“Kept one's eyes open (for).” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/kept%20one%27s%20eyes%20open%20%28for%29. Accessed 31 Oct. 2025.
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Merriam-Webster unabridged
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