Don't burn your bridges

Meaning

Do not sever relationships you might need later.

Usage

Common advice when exiting a job or dispute.

Origin & History

Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.

Based on military practice of destroying bridges so enemies cannot follow.

Used in 19th-century military handbooks and still taught as diplomacy guidance.