Luckily, this fish is now 'off the hook.'
Off the hook: 1) not in a difficult situation anymore; 2) when a telephone receiver is not put correctly on the phone and it prevents incoming calls.
This idiom's origins come from the idea that a fish has found a way to get off the hook of a fishing pole—and has therefore escaped great danger. In the same way, if you get off the hook you've escaped a difficult situation.
Another meaning is that the receiver of a telephone is not connected to the phone. The receiver is placed on the hook of the phone.
When the receiver is ON the hook calls can be received and the phone will ring (make a sound to let you know there is a phone call).
You can intentionally or accidentally take your phone off the hook. Often the phone is off the phone by mistake when the person doesn't carefully put the phone back in place.
Finally, there is a similar idiom: a phone rings off the hook. This means the phone is ringing continually one call after the other. (You could remember this because the phone is ringing so much it could almost fall off the hook.).
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Ready to write some practice sentences? There are a few different meanings for this idiom so it would be great if you try to write a sentence for each meaning. I will provide feedback for any sentences you write.