As cool as a cucumber
/əz kuːl əz ə ˈkjuːkʌmbə/informalUK · US
What does “As cool as a cucumber” mean?
As cool as a cucumber means very calm, even under pressure
While everyone else searches for a missing passport, one traveller calmly checks the bags. They are as cool as a cucumber.
It describes how someone appears. They may still feel nervous inside, and their calmness does not prove that they know what to do.
When do people say it?
Use it when someone stays impressively calm during a stressful or surprising event. It usually sounds admiring or lightly amused.
“When the lights failed on stage, Maya stayed as cool as a cucumber.”
Is it formal or informal?
Register: informal. It is most at home in everyday conversation rather than formal writing. Most common in UK and US.
Where does it come from?
The comparison uses “cool” to mean calm rather than physically cold. The cucumber supplies the playful image.
Origin confidence: Disputed; treat with caution
How do you say “As cool as a cucumber” in other languages?
Last updated 2026-10-01