Some words have a secret meaning. 
Some phrases have a secret meaning. 
Have you ever heard someone say it is "raining cats and dogs"? They do not mean animals are falling from the sky. They mean it is raining very hard. These special phrases are called idioms. An idiom is a group of words with a secret meaning. This meaning is different from the words themselves. 
In English, there are about 25,000 idioms. Some idioms come from old ways of doing things. The phrase "spill the beans" means to tell a secret. Long ago, people used beans to vote. If the jar spilled, the secret vote was out! Other idioms are just for fun. People say "break a leg" to wish a performer good luck.
Idioms can be tricky to learn. If you translate them word-for-word, they might not make sense. In Polish, people say "kick the calendar" to mean someone died. In English, we say "kick the bucket." Even though the words are different, the meaning is the same. 
Have you ever heard someone say it is "raining cats and dogs"? They do not mean animals are falling from the sky. They mean it is raining very hard. These special phrases are called idioms. An idiom is a group of words that carries a figurative meaning. This means the meaning is different from the literal meaning of each word. 
Most idioms do not follow the rule of compositionality. Compositionality is the idea that the meaning of a whole comes from its parts. If you understand every single word, you should understand the whole phrase. However, idioms break this rule. If you hear "Fred kicked the bucket," you might think he hit a pail. In reality, the idiom means that Fred has died. Because the meaning is not just the sum of its parts, speakers store the whole phrase as one single unit in their minds.
Many idioms have very interesting histories. Some phrases were meant to be literal a long time ago. The expression "spill the beans" means to reveal a secret. This might come from an ancient way of voting with beans in jars. If the jar spilled, the secret results were revealed too early. Other idioms are meant to be figurative from the start. For example, people say "break a leg" to wish a performer good luck. It sounds like a wish for an injury, but it is actually a kind wish.
There are many different types of idioms in the English language. Experts estimate there are about 25,000 idiomatic expressions in English alone. Some idioms are "fixed," which means you cannot change the words. You can say "the beans were spilled," but you cannot say "the bucket was kicked" to mean someone died. Other idioms are "mobile" and allow more movement in the sentence. Some are even called "irreversible binomials." These are two or three words used in a specific order, like "high and dry.
Idioms can be quite difficult when you learn a new language. If you translate them word-for-word, they often lose their meaning. For example, the English "kick the bucket" is translated into Polish as "kick the calendar." In French, they say "to break one's pipe." 
An idiom is a unique type of expression used in human language. These phrases carry a figurative meaning rather than a literal one. This means the overall message is different from the individual definitions of the words used. Idioms are a type of formulaic language. They occur frequently in all known languages across the world. In the English language alone, experts estimate there are about 25,000 idiomatic expressions. 
To understand how idioms work, linguists look at the principle of compositionality. Compositionality is the idea that the meaning of a whole phrase is built from its parts. If a phrase is compositional, you can understand it by knowing each word. For example, if someone says "Fred kicked the bucket," a compositional reading means Fred hit a physical pail with his foot. However, the idiomatic meaning is non-compositional. In this case, it means that Fred has died. Because the meaning does not follow the parts, speakers store the entire idiom as a single lexical item in their minds.
Idioms vary in how much they can change within a sentence. Some are considered fixed idioms. A fixed idiom cannot undergo many changes without losing its meaning. For instance, you can say "the beans were spilled," but saying "the bucket was kicked" to mean someone died is confusing. Other expressions are mobile idioms. These allow for syntactic modifications like passivization. A mobile idiom like "spill the beans" can be moved around while keeping its meaning. Some idioms are even semantically composite. This means they have a structure similar to their actual meaning, such as having a verb and an object.
There are also specific patterns called irreversible binomials. These are groups of two or three words that always stay in a specific order. For example, a person might be left "high and dry," but they are never left "dry and high." While these are specific sequences, not all binomials are idioms. The phrase "chips and dip" is an irreversible binomial, but its meaning is literal and straightforward. This distinguishes them from true idioms that require figurative interpretation.
Many idioms have fascinating histories and origins. Some may have started as literal descriptions. The phrase "spill the beans" might come from an ancient voting method. In that system, people placed beans in jars to vote. If the jar spilled, the secret results were revealed too early. Other idioms are deliberately figurative. The phrase "break a leg" is used to wish a performer good luck. It sounds like a wish for an injury, but it is actually a kind gesture. Some idioms are even so common that they become regular words. In Portuguese, the phrase for "knowing by heart" eventually shortened into the verb "decorar," which means to memorize.

Translating idioms is a major challenge for language learners. A word-for-word translation often fails to convey the correct meaning. For example, the English "kick the bucket" has different equivalents in other languages. In Polish, the equivalent is "kick the calendar." In French, people say "to break one's pipe." In Italian, they use the phrase "pulling the leathers." However, some idioms are transparent and easier to understand. The phrase "lay one's cards on the table" is somewhat transparent because its meaning is close to its literal sense.
Interestingly, some idioms are shared across many different cultures. The Arabic phrase "in the same boat" carries the same meaning as the English version. The Japanese phrase "one stone, two birds" is similar to the English "to kill two birds with one stone." Some expressions are even more widespread. The phrase "to get on one's nerves" is used in 57 different European languages. Scientists believe these shared idioms might come from a shared ancestor language. They might also come from "calques," which are word-for-word translations between languages during contact. This shows how deeply connected human communication can be.
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