Ask five Britons where "it's raining cats and dogs" comes from and you will get five confident answers. Almost none of them can be proved. That is the pleasure of idiom: the everyday phrases we reach for are small archaeological sites, layered with Norse myth, Victorian workshops and East End wordplay. Here are the stories behind a few favourites, plus a few tips for using them without sounding like a phrasebook.
Where "raining cats and dogs" really comes from
The phrase is old. It appears in print in the early eighteenth century, and Jonathan Swift used it in his 1738 collection of polite conversation, which tells us it was already well established in speech long before anyone wrote it down. The trail before that goes cold, and that is exactly why the theories are so plentiful.
The three favourite theories
- Norse mythology. Odin, the god of storms, was associated with dogs, while cats were linked to witches and weather magic. The picture of animals tumbling out of a thundercloud fits the drama, but no Norse text uses the phrase.
- Thatched roofs. The story goes that cats and dogs sheltered in the thatch, then tumbled out when it rained hard. Charming, but weak: cats and dogs rarely lived in thatch, and steep thatch sheds water rather well.
- Filthy streets. In crowded cities, gutters and open drains would have carried all sorts of debris along in a downpour, including dead animals. Plausible in spirit, though nobody has found a written record linking the two.
There is also a popular suggestion that the phrase comes from the Greek kata doxa, meaning "contrary to belief". It sounds clever, and most etymologists are not convinced. The honest answer is that we simply do not know. The phrase survives because the image is so vivid, not because the paperwork is in order.
The Cockney trick that gave us "butcher's"
Cockney rhyming slang works on a simple device: replace a word with a phrase that rhymes with it, then drop the rhyming half. "Butcher's hook" becomes "butcher's", meaning look. The rhyme does the work; the missing word does the hiding.
- Butcher's hook → look: "Have a butcher's at this."
- Apples and pears → stairs: "Get up the apples."
- Dog and bone → phone: "Where's my dog?"
- Loaf of bread → head: "Use your loaf."
- Rabbit and pork → talk: "Stop rabbiting."
It grew up in the East End in the nineteenth century, among market traders and dock workers. Part in-joke, part privacy, it let people talk freely in front of customers and strangers. A fair amount has since crossed into general British speech, usually in clipped form. Treat it as a wink rather than a code: a well-placed "use your loaf" lands nicely; a full sentence of it sounds like a novelty tea towel.
Idioms with a day job behind them
Several of our strangest phrases are occupational ghosts, left over from trades and conditions that have largely vanished.
Mad as a hatter comes from the felt-hat industry. Fur was treated with mercury compounds to make it mat, and hat-makers who breathed in the fumes over years developed tremors, slurred speech and confusion. Lewis Carroll's Hatter in 1865 fixed the phrase in the national imagination, though it had been used earlier.
Bite the bullet is usually explained by soldiers or surgeons working without anaesthetic, the patient clamping down on a lead ball. It is a good story and there is no firm documentary evidence for it, so enjoy it as folklore rather than fact.
Not enough room to swing a cat almost certainly refers to the cat o' nine tails, the naval whip. To use it properly, the sailor needed space around him, so cramped quarters became places where you could not swing a cat.
Spend a penny is Victorian politeness in three words. Public conveniences often charged a penny for a locked cubicle, and the phrase became a discreet way of announcing where you were going without saying it.
Uncles, moons and being chuffed
Bob's your uncle is the classic example of a neat story with a loose end. The usual explanation points to 1887, when the Prime Minister, Lord Salisbury, gave his nephew Arthur Balfour a senior Irish post. To critics it looked like pure nepotism: mention Bob, and the job is sorted. It is a satisfying tale, but no source from the period proves it, and older slang phrases such as "all is bob", meaning all is well, may have helped it along.
Over the moon has been used for centuries to describe extreme delight, and the cow jumping over the moon in "Hey Diddle Diddle" probably helped it stick in the memory. Chuffed, meaning quietly pleased, has murkier roots; it may come from a dialect word for swollen with pride. Nobody can say for certain, which has not stopped it becoming one of the most useful words in British English.
Idioms people keep mangling
Half the fun of these phrases is watching them get bent out of shape. A few worth getting right:
- "Damp squib", not "damp squid". A squib is a small firework. If it is damp, it fizzles instead of banging — a perfect description of an anticlimax.
- "One fell swoop", not "one foul swoop". Shakespeare gave us the line in Macbeth, and "fell" here means fierce or deadly.
- "Just deserts", not "just desserts". The word comes from deserve, so the phrase means the treatment you have earned, sweet or otherwise.
- "The proof of the pudding is in the eating." The shortened "the proof is in the pudding" loses the point: you judge a thing by testing it, not by looking at it.
How to use these phrases well
Idioms are social tools, not decoration. A few rules of thumb keep them working.
- Match the room. "Bob's your uncle" is warm and informal. In a formal report or a job application, it reads as forced. Save the slang for conversation.
- One per paragraph. Stacking idioms — a butcher's here, a dog and bone there, over the moon throughout — makes you sound like you are performing rather than talking.
- Keep the original wording. Swap "fell" for "foul" and someone will notice, quietly, and file it away.
- Check the meaning before you borrow it. Look at how the phrase is used in a sentence, not just what a dictionary gloss says. "Sick as a parrot" means disappointed, not ill, and it carries a slightly dated, football-terrace flavour.
- Listen to how older relatives use them. You will hear which phrases are alive, which are nostalgic and which have drifted into parody.
The best test is simple: if you would say it out loud to a friend without pausing for effect, it belongs. If you are reaching for it to show that you know it, put it back. The phrases have survived for centuries because they are quick, funny and useful — not because they are clever. Use them that way and they will keep earning their place.
Photo: Horacio30 / Pixabay
