hookhook2 noun [countableC] 1MARKETING something that attracts customers
Free hotel rooms are one of the hooks designed to bring in new clients.
2off the hook if a person or business is off the hook, they are allowed to get out of a difficult situation, especially one they might have been punished for
The broker isn’t off the hook yet for the security violations.
3be on the hook (for something) American EnglishAmE to have to pay for something, especially something that is not really your responsibility
Two dozen banks are on the hook for at least $100 million each.