be careful, pay attention, hearken, listen, notice, have a care, heads up*; see also watch out.
See look out in Webster's New World Roget's A-Z Thesaurus II
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Browse entries near look out
look like the cat that ate the canary
look on
look on (idioms)
look on the bright side
look oneself
look out (idioms)
look out for
look over
look over (idioms)
look sharp
