Definition & Meaning of "murder will out"

What is the origin of the proverb "murder will out" and when to use it?

The proverb "murder will out" originates from Geoffrey Chaucer's 'The Canterbury Tales,' written around 1386. It reflects the belief that serious crimes, particularly murder, are difficult to conceal and will eventually be uncovered, no matter how well one tries to hide them. While the phrase originally referred to the inevitability of criminal actions being exposed, it is often used more broadly today to suggest that secrets or wrongdoings have a way of coming to light. The proverb serves as a reminder to act with integrity and honesty, as attempts to cover up misdeeds are likely to fail in the long run.