(as) cool as a cucumber
01
untroubled by hot temperature or physically difficult actions
例
He leaps up the six flights of stairs and arrives at the top as cool as a cucumber.
02
落ち着き払っている, まったく動じない
used to describe someone who is not worried at all in challenging or stressful situations
approving
idiom
informal
例
Despite the intense competition, he kept his cool as a cucumber and delivered a flawless performance.
危機の最中でも、彼女は落ち着き払っていた。
