Look out vs Watch out

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

Look out

Top 2,000 (common)

Watch out

InformalTop 2,000 (common)
Most formal: Look out
 Look outWatch out
Pronunciation🇬🇧 //lʊk aʊt//🇺🇸 //lʊk aʊt//🇬🇧 //wɒtʃ aʊt//🇺🇸 //wɑtʃ aʊt//
MeaningBe careful or watch for something.Be careful.
ExampleLook out for cars when crossing the street.Watch out for the car coming around the corner!
RegisterNeutralInformal
How commonTop 2,000 (common)Top 2,000 (common)
Collocationslook out for danger, look out for each other, look out from the windowwatch out for, watch out now, watch out ahead, watch out back, watch out below
Common mistakesConfused with 'look after' which means to care for someone., Using 'look out' incorrectly in passive voice., Misusing 'look out' as a noun.Omitting 'for' when specifying what to watch out for., Using 'watch out' as a command without context., Confusing 'watch out' with 'look out' although they are similar.
Usage notesUsed to warn someone of danger or to advise them to be cautious. It is appropriate in everyday conversations but may sound too informal in formal writing.Use 'watch out' to warn someone about danger. It's informal, suitable for conversations, but not for formal writing.

See it in real clips

Look out
Watch out

Frequently asked questions: Look out vs Watch out

What's the difference between Look out and Watch out?

Look out: Be careful or watch for something. Watch out: Be careful.

Which is more formal: Look out and Watch out?

Look out is the most formal of these.

Can you show an example of each?

Look out: Look out for cars when crossing the street. Watch out: Watch out for the car coming around the corner!

Can I use Look out and Watch out interchangeably?

Not always. Look out and Watch out 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.