Select the most appropriate meaning of the following idiom.
Be on a high alert
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. Be watchful and ready to take action.
Idiom: Be on a high alert
Meaning: To be very vigilant or watchful, especially in a situation of possible danger or threat.
Example: After the warning of a possible storm, the coastal guards were on a high alert.
Hence, the chosen option will be correct.