A
cucumber is a gourd that is usually stored cold in a fridge (in the West, anyway). Thus, to be "cool as a cucumber" is to be very cool; that is, level-headed, even-tempered, in strong command of oneself. Ex.: "You've already done one TV interview. You'll be cool as a cucumber in the next one!"
For the record, while I have no doubt someone could drop the 'a' in speech, I made an innocent reading error while writing this post originally. I have edited the post appropriately. Have a nice day.
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