Keep an eye on vs Monitor

When to use each in English, with meaning, register, and examples.

Keep an eye on

Top 2,000 (common)

Monitor

Top 2,000 (common)B2noun
 Keep an eye onMonitor
Pronunciation🇬🇧 //kiːp ən aɪ ɒn//🇺🇸 //kip ən aɪ ɑn//🇬🇧 /["/ˈmɒnɪtə(r)/"]/🇺🇸 /["/ˈmɑːnɪtər/"]/
Meaningto watch or pay attention to someone or somethingA screen used to see pictures or text from a computer.
ExampleCan you keep an eye on the kids while I cook?The teacher will monitor the students' progress throughout the semester.
RegisterNeutralNeutral
How commonTop 2,000 (common)Top 2,000 (common)
CEFR level-B2
Part of speechnoun
Collocationskeep an eye on someone, keep an eye on something, keep a close eye oncolour/​color, digital, CCTV, on a/​the monitor, baby, foetal/​fetal, heart, detect something, display something, show something, hooked up to a monitor, UN, ceasefire, election, UN, ceasefire, election
Antonymsignore, neglectignore, neglect
Common mistakesConfusing with 'watch over', which means to protect instead of just monitor., Using in overly formal situations where simpler phrases would work better.Confused with 'minotor', a common misspelling., Using 'monitor' as a verb without an object, e.g., 'I will monitor' instead of 'I will monitor the situation.'
Usage notesUse in contexts where you need to monitor someone or something. More casual than 'observe'.Use 'monitor' when referring to computer screens or when talking about observing something continuously. More formal contexts may use it to describe supervision or tracking.

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Keep an eye on
Monitor

Frequently asked questions: Keep an eye on vs Monitor

What's the difference between Keep an eye on and Monitor?

Keep an eye on: to watch or pay attention to someone or something Monitor: A screen used to see pictures or text from a computer.

Can you show an example of each?

Keep an eye on: Can you keep an eye on the kids while I cook? Monitor: The teacher will monitor the students' progress throughout the semester.

Can I use Keep an eye on and Monitor interchangeably?

Not always. Keep an eye on and Monitor are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

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