keep an eye on

/kip ən aɪ ɑn/
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To watch someone or something carefully, often to keep them safe or notice a change.

Examples

  • Have you been keeping an eye on your electricity use?
  • We need to keep an eye on the weather before setting off.
  • She kept an eye on the children while they played by the water.
  • Could you keep an eye on my bag while I buy the tickets?
  • The nurse is keeping an eye on his temperature tonight.

Similar words

keep tabs on
watch
look after
monitor
watch over

Meanings

Watching or caring for

everyday
informal
To watch someone or something carefully for a time, either to take care of them or to notice what happens.

Examples

  • Could you keep an eye on my bag while I buy the tickets?
  • We need to keep an eye on the weather before setting off.
  • She kept an eye on the children while they played by the water.
  • Have you been keeping an eye on your electricity use?
  • I'll keep an eye on the soup so it doesn't boil over.
  • The nurse is keeping an eye on his temperature tonight.

Similar words

Etymology

Built from keep, meaning to continue or maintain, and eye as an image of watchful attention. The expression keep an eye on in the sense of keeping someone or something under supervision is recorded from the early 1400s.

FAQ

What does keep an eye on mean?

To keep an eye on someone or something is to watch carefully, often to provide care or notice a change.

Is keep an eye on an idiom?

Yes. Keep an eye on is an everyday idiom about watchful attention, not a request to place an eye on something.

What is the past tense of keep an eye on?

The past form is kept an eye on, as in ‘She kept an eye on the children.’

Can keep an eye on mean look after someone?

Yes. It often means watching someone briefly to help keep them safe, though it can also mean monitoring a situation or a change.

What is the difference between keep an eye on and keep an eye out for?

Keep an eye on means watch someone or something already present. Keep an eye out for means watch for someone or something to appear.

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