be as cool as a cucumber

be as cool as a cucumber

  (humorous)
to be very calm and relaxed, especially in a difficult situation I expected him to be all nervous before his interview but he was as cool as a cucumber.
See also: cool, cucumber
References in periodicals archive ?
Everyone seems to be as cool as a cucumber about the prospect of abseiling, but I am sure that that will change when they are dangling at the end of a rope