One of the mysteries of the English language finally explained.
1‘‘Watch out’ he yelled’
be careful, be watchful, beware, be on the watch, be wary, be cautious, be on your guard, mind out, look out, pay attention, take care, take heed, have a care, be on the alert, be on the lookout, keep a sharp lookout, be vigilant, be on the qui vive
informal keep an eye open, keep an eye out, keep one's eyes peeled, keep one's eyes skinned
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