keep an eye on

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keep an eye on (third-person singular simple present keeps an eye on, present participle keeping an eye on, simple past and past participle kept an eye on)

1. (idiomatic) To watch and pay attention to, in case of misbehaviour or mishap.

   I must keep an eye on this sauce in case it curdles.

   • 2022 November 16, Philip Haigh, “Network News: TPE under fire over "unacceptable" cancellations”, in RAIL, number 970, page 7:

     "[...] We are making sure that a firm eye is kept on this."

• keep an eye out for
• have an eye to
• with an eye to
• keep a close watch on