The 'alert' group
These nouns are used to indicate that someone is alert.
on alert on the alert (for ...) on the lookout (for ...) on the watch (for ...) on my guard (against ...) on my toes
Troops stationed in the region have been put on alert.
He warned holidaymakers to be on their guard.
As a non-writer, she relies on a pool of mostly Irish songwriters and is always on the lookout for new talent.