|2.||cool as a cucumber|
Someone with a normal temperature, ie, not a fever.
Kid: "I think I might have a fever... I'm really feeling sick."
Kid's mom: "Let me feel your forehead." (pause) "Nope, cool as a cucumber."
|1.||cool as a cucumber|
(adj.) Cool with the added simile of a watery vegetable.
He was as cool as a cucumber.