very calm and relaxed even in a difficult situation
If someone is (as) cool as a cucumber, he/she is very relaxed and/or calm when you expect him/her to be nervous or upset.
He had very bad news last night, but he came to the office as
cool as a cucumber this morning as if nothing had happened.
She was cool as a cucumber even right after she was fired.

This picture was electronically drawn by Erika Aoyama on April 14, 2003.
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Last modified on April 25, 2003