SCIENCE

The Surprising Origins Of 'Let The Cat Out Of The Bag' And Three Other Common Expressions

06/04/2015 03:42 pm ET | Updated Jun 04, 2015

Ever wonder where certain expressions came from? A new video (above) "lets the cat out of the bag" about that expression and three others that are as strange as they are familiar.

"If you were alive in the Middle Ages and wanted to buy a pig at a market, that pig would be put in a bag and given to you to take home," narrator Pat Graziosi explains in the video, part of the online series Life Noggin. "But don't be too trusting. Some salesmen may give you a cat in a bag instead."

Now that that feline has been freed, check out the video for the origins of "break a leg," "the bee's knees," and "apple of my eye."

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