1
alert
adjective
- able to think clearly and to notice things —often + to
2
alert
noun
- something (such as a message or loud sound) that tells people there is some danger or problem : an alarm or signal of danger
- the state of being ready for something you have been warned about (such as an attack)—used with on
3
alert
verb
- to give (someone) important information about a possible problem, danger, etc. : to warn (someone)
- to make (someone) aware of something —often + to
