Keep your cool

Meaning

Stay calm under pressure.

Usage

Used to praise composure.

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.

Temperature metaphor equating calmness with coolness.

Used since the early 20th century in sports and social advice.