English version

keep a sharp eye on somebody

From Longman Dictionary of Contemporary Englishkeep a sharp eye on somebodykeep a sharp eye on somebodyWATCHto watch someone very carefully, especially because you do not trust them Keep a sharp eye on the kids at all times! sharp
Examples from the Corpus
keep a sharp eye on somebodyI keep a sharp eye on him.Security guards kept a sharp eye on Mattson as he walked through the store.As a teen-ager, I kept a sharp eye on who was winning the prizes I wanted: Honor Roll.
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