What are the Origins of the Phrase "Let the Cat out of the Bag"?

Interesting to see the level of diverse opinions about this.

I have read some old stories that cause me to believe that the correct answer is to do with the drowning of cats.

Yes indeed, putting kittens into a bag and drowning them was a very common and widespread practice for dealing with cat overpopulation. It also can be traumatic for children. Letting the cat out of the bag means that you have to deal with the consequences of having of take care of the cats.

Similarly, if you let a secret out of the bag e.g. reveal it. then you will have to deal with the consequences which result from that revelation. "He let the cat out of the bag" (revealed the secret) and now we have to deal with the consequences.

"Pig in a poke" certainly does refer to markets as this article states, but it is implausible that someone would try to pull a fast one, by putting a cat into a bag instead. There is a huge difference in both weight and shape. Nobody would be fooled by the substitution. It doesn't pass the smell test.

I agree with anon77124.

The nautical reference was that once the cat-o-nine tails was removed from the bag the discipline could not be stopped or undone. "There is no going back" to put it another way. Similarly, once a secret or scam is revealed, there is no undoing of the revelation.

A sailor trying to avoid punishment may be told, "Too late. The cat's out of the bag."

It's obviously a reference to drowning cats.

Please add to the prior post about the beaten cat in the bag, that I am referring to a Medieval practice in the British Isles.

"Letting the cat out of the bag" could mean letting a live, very angry and beaten cat out of the bag, before it had been beaten to death. In Medieval times there were festivals where one of the activities was that men would take turns swinging sticks at a suspended bag with a cat inside of it. Reference: "Stations of the Sun" published by the Oxford Press.

The Christians (and probably many other people) didn't like this practice and tried to outlaw it, as they superseded many localized festivals.

At any rate, if you let such a cat out of the bag, chaos ensues, as you have a very angry cat. So the expression means, letting something out verbally that will disrupt things considerably. --mvzp

Keeping in mind that phrases like letting the cat out of the bag can potentially have many points of origin (such as the phrase "the whole nine yards").

I was told letting the cat out of the bag did have to do with a whip but it was with the Army and not the navy. in the 19th century, the head drummer in an army regiment known as the drum major was known to have carried the cat of nine tails in a bag tied to his belt. thus when "letting the cat out of the bag" it could mean that someone has gotten themselves into trouble.

Traditionally the cat-o-nine-tails was kept in a special bag. When the cat was "out of the bag", it meant that someone (who's secret, or crime, is revealed) was about to be punished. This medieval theory about markets is too complicated, the thing about kids and kittens is ridiculous and sending messages by tattoos on cats -- you can't be serious!

you all seem to forget that this phrase origins are, indeed, from the medieval times.

I think this comment means to tell a secret that should not have been told which happens a lot with my friends and me.

I think this website helped me a lot.

I've used the phrase for a slightly different meaning, but I figure I'm wrong: It's damn hard to get a cat into a bag in the first place (and especially a second time) but easy to get it out (it will run out of its own accord). Hence I use it to mean e.g. informing people about a secret. It's damn hard to "un-publish" something that people already know about.

I don't believe that anon26308's comment is true at all, not just for cruelty reasons. It's a very slow process compared to how you could manufacture other means for transporting secret messages.

Cats reproduce at a considerable rate. now we have humane ways of controlling the population but this was not always so. In the past, a common way of dealing with unwanted kittens was to place them in a bag and drown them.

Children of course tend to get very emotional about such things, so secrecy was usually required. To let the cat out of the bag is to suddenly find yourself responsible for the care and feeding of a whole bunch of unwanted cats or risk traumatizing your children.

I think that Occam's razor works pretty well here.

The term cat out of the bag actually refers to the secret ways they used to send information to each other back in medieval days. They would shave a cat, then tattoo messages on the cat. They would put the cat in the bag until the hair grew back to cover the messages. If you let the cat out of the bag too early, you can see the secrets.

"Removing a whip from a bag is clearly not a euphemism for revealing a secret or spoiling a scam."

Unless that secret scam was mutiny. I could well imagine secret plotters fearing the removal of said whip. I could easily envision one conspirator whispering, "Keep quiet, lest ye let the cat out of the bag."

Considering furthermore that the origins of the phrase "Not enough room to swing a dead cat" hearkens back to the aforementioned cat-o-nine-tails. Smaller rooms on board did not provide enough room to wield the whip effectively, and therefore, there was not enough room to swing the cat. (The phrase evolved through usage to include the "dead" part. Apparently people don't like cats much.)

As to your initial hypothesis ... have you ever put a cat in a bag? They are not known to be patient animals who take kindly to confinement. Cats have claws and teeth, and their usual first reaction to any form of distress is to use them to good effect.

Can you imagine someone buying a pig - which, even small, must weigh a good 40-50 pounds or so - and, even in a bag, not being able to tell the difference from a cat?

And can you further then imagine that pig-mimicking cat staying in the bag quietly, silently, biding its time?

Doesn't seem to add up to me.

Furthermore, people in Medieval times tended to live close together. They lived and worked and traded together on a more or less constant basis. People just didn't travel much.

Not to say that people didn't cheat each other back then, but odds are if you buy a goat, somehow mistake a cat in a bag for a goat in a bag, and then walk all the way home before finding out you've been swindled ... well, you're going to just turn around and go back again and raise some royal hell.