Watch out for the cars when you cross the street.
watch out
idiomTo be aware or conscious; to look closely or carefully; to use caution. Often used in the imperative.
Origin
disputed originwatch + out
You should watch out for slippery floors because the cleaning crew just finished mopping the hallway.
The guide warned the hikers to watch out for loose rocks along the narrow mountain path, as a single misstep could prove fatal.
- 01
keep a close watch
to pay careful attention to a situation or a thing, so that you can deal with any changes or problems.
- 02
keep watch
To guard; to watch over someone or something.
- 03
on one's watch
During the period of time when one is in a position of authority or responsibility.
- 04
set one's watch back
To ponder or experience a past time.
- 05
set one's watch by someone
To know the current time by observing a very punctual and reliable person going about their regular routine.
- 06
watch it
To be careful or cautious; to pay attention to what one is doing (usually imperative).
- 07
watch one's language
To be careful about what one says, in particular the avoidance of foul language.
- 08
watch one's mouth
To be careful about what one says, especially with regard to disrespectful or profane language.
Last updated April 17, 2026