Keep watch vs Monitor

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

Keep watch

Top 3,000 (common)

Monitor

Top 2,000 (common)B2noun
Most common: Monitor
 Keep watchMonitor
Pronunciation🇬🇧 //kiːp wɒtʃ//🇺🇸 //kiːp wɑtʃ//🇬🇧 /["/ˈmɒnɪtə(r)/"]/🇺🇸 /["/ˈmɑːnɪtər/"]/
MeaningTo stay alert or pay attention, especially for danger.A screen used to see pictures or text from a computer.
ExampleHe was asked to keep watch over the campsite at night.The teacher will monitor the students' progress throughout the semester.
RegisterNeutralNeutral
How commonTop 3,000 (common)Top 2,000 (common)
CEFR level-B2
Part of speechnoun
Collocationskeep watch over, keep a close watch, keep watch for, keep watch at night, keep vigilant watchcolour/​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
Antonyms-ignore, neglect
Common mistakesConfused with 'keep an eye on', which suggests a less formal level of vigilance., Using inappropriately in passive voice, as 'watch kept' sounds unnatural.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 notesUsed when monitoring a situation or being vigilant. Appropriate in both formal and informal contexts when discussing safety or alertness.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 watch
Monitor

Frequently asked questions: Keep watch vs Monitor

What's the difference between Keep watch and Monitor?

Keep watch: To stay alert or pay attention, especially for danger. Monitor: A screen used to see pictures or text from a computer.

Which is more common: Keep watch and Monitor?

Monitor is the most common in everyday English.

Can you show an example of each?

Keep watch: He was asked to keep watch over the campsite at night. Monitor: The teacher will monitor the students' progress throughout the semester.

Can I use Keep watch and Monitor interchangeably?

Not always. Keep watch 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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