let sleeping dogs lie

let sleeping dogs lie idiom
Allow inactive problems to remain so, as in Jane knew she should report the accident but decided to let sleeping dogs lie. This injunction to avoid stirring up trouble was already a proverb in the 13th century. It alludes to waking up a fierce watchdog and has been stated in English since the late 1300s.

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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