Transpire comes from the Latin verb spirare (“to breathe”), which also breathed life into perspire, aspire, and inspire, among other words. Wafting up into English in the late 16th century, transpire was originally used (as it still is) for the action of vapor passing out of the pores of a living membrane such as the skin. From this use followed the related senses of “to become known” and “to be revealed; to come to light” (think of information “leaking” or “slipping out”).
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John William Tuohy lives in Washington DC