As cool as a
cucumber: Calm and unruffled.
"Cool here means imperturbable rather than having a low temperature.
Cucumbers are cool to the touch.
First recorded in John Gay's Poems,
New Song on New Similies, 1732:
"I ... cool as a cucumber could see The rest of womankind."
"Calm and composed, self-possessed, as in Despite the mishap Margaret was cool as a cucumber ."
This idiom
may be based on the fact that in hot weather the inside of cucumbers remains
cooler than the air.
I never thought about comparing someone to a cucumber…
The first time I read this expression I thought that cool meant great, attractive, beautiful and different, and it's very strange to think of cucumbers this way. That would be a "hot" cucumber??? No… I don't think so.
Then I realized that they were talking about the cucumber
temperature. Hummmm… ok, It's
weird anyway!
And you? Are you as cool as a cucumber even if you have a
hot potato in your hands???