go back on

go back on idiom
Fail to honor or keep, as in You can't go back on your word, or One should never go back on a promise. [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.

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