keep a sharp lookout (for something or someone)

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keep a sharp lookout (for something or someone)

To remain vigilant or carefully watchful (for something or someone). They should be arriving any minute, so keep a sharp lookout. Keep a sharp lookout for a Christmas present we could give your mother. Keep a sharp lookout for the health inspector, we heard he'll be doing a surprise inspection someday soon.
References in periodicals archive ?
CHILDREN are being urged to keep a sharp lookout for drugs needles after a shocking report revealed that an increasing number of syringes are being found on school grounds.
Since the mechanics are difficult to execute in the match setting, coaches have to keep a sharp lookout for mistakes.