To let sleeping dogs lie means it is better not to bring up old problems or arguments that could cause trouble again. The idea is to leave a situation alone if disturbing it might make things worse.
The saying has been used in English for several centuries and was recorded in writing as early as the 1300s. It compares old troubles to a sleeping dog that may bite if someone wakes it.
The saying has been used in English for several centuries and was recorded in writing as early as the 1300s. It compares old troubles to a sleeping dog that may bite if someone wakes it.
Everyone remembered the old disagreement, but they decided to let sleeping dogs lie.