watchout
nounUK /ˈwɒtʃaʊt/
US /ˈwɑːtʃaʊt/
A watchout is a person who stays awake to keep others safe.
The watchout stayed by the fire while the others slept.
OTHER MEANINGS
2. A warning to be careful about danger.
The sign was a watchout for slippery floors.
3. A person who warns others of trouble.
He acted as the watchout for the whole team.
4. A careful look for something.
Keep a watchout for the missing dog.