Definitions

1. noun

a state of being awake and ready to react to a situation

“The security team went on high alert after the fire alarm sounded.”

2. verb

to make someone aware of a situation or danger

“The doctor alerted the nurse to the patient’s critical condition.”

3. adjective

watching or ready to react to a situation

“The police were on high alert for the suspect.”

4. adverb

used to indicate that something is happening suddenly or unexpectedly

“He was alerted to the news and immediately responded.”