Select the most appropriate meaning of the given idiom.

Off and on

again and again

The most appropriate meaning of the idiom "Off and on" is: Again and again.

Explanation:
"Off and on" refers to something that happens intermittently or irregularly, with periods of activity alternating with periods of inactivity. It implies a recurring or sporadic occurrence. Therefore, "again and again" accurately captures the meaning of the idiom.