Over at Flavorwire, they’ve been discussing how the meanings of words has evolved over time. One of the most interesting ones we saw was on the origins of cool as we currently understand it today. According to the Online Etymology Dictionary, its earliest slang meaning dates to 1728, to describe large sums of money, a usage still in circulation. It started to mean “calmly audacious” in 1825, and “fashionable” in 1933.
Click the pic to find out when other colloquialisms first emerged.