off the hook

Etymology 1
An allusion to a fish caught on the hook of a fishing line.

Adjective

 * 1)  Relieved of a duty, burden, responsibility, or pressure.

Etymology 2
Referring to the candlestick phone, which in order to hang up, the receiver must be hung on a hook. Leaving the receiver off the hook would prevent it from being able to receive calls.

Adjective

 * 1) Of a telephone, having an open connection; not hung up.
 * 2) Of a telephone, ringing frequently.
 * 1) Of a telephone, ringing frequently.

Etymology 3
.

Adjective

 * 1)  Performing extraordinarily well.
 * 2)  Fresh, cool, trendy, excellent, incredible.
 * 1)  Fresh, cool, trendy, excellent, incredible.