Definitions from Wiktionary (sleep with one eye open)
▸ verb: (figurative) To remain vigilant at all times, especially by remaining partially awake or sleeping only lightly so as to avoid being caught off guard.
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▸ verb: (figurative) To remain vigilant at all times, especially by remaining partially awake or sleeping only lightly so as to avoid being caught off guard.
Similar:
keep an eye open,
keep one's guard up,
keep one's eyes peeled,
keep one's eyeballs peeled,
keep one's head on a swivel,
keep one's eyes skinned,
keep a lookout,
look out,
watch one's back,
keep an eye peeled,
more...
Opposite:
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▸ Idioms related to sleep with one eye open
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▸ Rhymes of sleep with one eye open
▸ Invented words related to sleep with one eye open