Be careful or vigilant; keep a sharp look out; keep your eyes open to guard against mischief. School-boy wit, Mens tuus ego.
“‘Perhaps it may be soʹ (says I); ‘but mind your eye, and take care you donʹt put your foot in it.ʹ”—Haliburton.
“‘You must mind your eye, George; a good many tents are robbed every week.ʹ”—C. Reade.
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