Debes ponerle ojo al niño.

English Translation

You must keep an eye on the child.

Is this a commonly used expression?

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Yes, it’s a commonly used informal expression.

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I found this that may interest you.
https://www.quia.com/jg/1397167list.html
There are expresions in Spanish that use the word ojo and some are similar to English.

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Thanks! Most of them were new to me, and some I recognize from the corpus.

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