swear off

swear off idiom
Pledge to renounce or give up, as in I've sworn off cigarettes. This expression was first used for abjuring liquor in the first half of the 1800s but has since been broadened to just about anything.

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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