Comprehensive resource for understanding and mastering English idioms
The idiom "cool as a cucumber" means to remain calm and composed under pressure or stressful situations. The phrase is used to describe someone who is unfazed by what might otherwise rattle others. The word "cool" itself means relaxed, while the comparison to a cucumber suggests a sense of unflappability.
The origin of the idiom "cool as a cucumber" dates back to the 16th century, where it was first used in print by John Heywood in his book "A Dialogue Conteinyng the Nomber in Effect of All the Proverbes in the Englishe Tongue." The phrase comes from an earlier idiom "cool as a fish," which was also used to describe someone who remained calm under pressure. The comparison to a cucumber may have been made because it is often associated with relaxation and refreshment, evoking a sense of tranquility.