Lower your guard

Meaning

Relax your vigilance.

Usage

Used when warning against complacency.

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.

Fighting or fencing imagery of dropping defensive posture.

Common in 19th-century military and sports writing.