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off the hook

off the hook idiom

Also, get or let off the hook. Released (or be released) from blame or annoying obligation, as in He was out of town during the robbery so he was off the book, or I don't know how the muggers got off the hook, or Once they found the real culprit, they let Mary off the hook. This idiom alludes to the fish that manages to free itself from the angler's hook and get away. [Mid-1800s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.