Select the alternative which best expresses the meaning of the given idiom.
Break down

The correct answer is "To fail."
Explanation:
· "Break down" is an idiom that means to stop working or to fail completely.
· It is commonly used to refer to mechanical failures (e.g., cars, machines) or emotional collapses.
· "To walk a long way", "To ignore someone", and "To exercise" do not match the meaning of the idiom.
Example
· "His car broke down in the middle of the highway."