onalert
adjectiveUK /ɒn əˈlɜːt/
US /ɑːn əˈlɜːrt/
Watching and ready to act if something happens.
The guard stayed on alert all night.
RELATED WORDS
OTHER MEANINGS
2. Ready to respond quickly to danger or trouble.
The soldiers were on alert for any sudden attack.
3. Paying close attention to what is happening around you.
She was on alert for any change in the patient's breathing.
4. In a state of official warning about a possible emergency.
The whole town was on alert during the storm.