He gave them some ridiculous explanation, and they fell for it 'hook, line and sinker'. [=they believed his explanation completely]
He counted on his friends to 'get' him 'off the hook'. [=to protect him from trouble or punishment]
The phone was 'ringing off the hook' all morning. [=many people called during the morning]
(..) Apple core, trash. You can do the rest. Why do you still have these toys? Molly, out of my room! Three more days and it's mine! Molly, you're not off the hook either. You have more toys than you know what to do with. Some of them could make other kids really happy. What kids? (..)2010 Toy Story 3