What is an idiom?

An idiom is defined as a phrase that has a figurative meaning that is different from the literal meanings of the individual words within it. This figurative meaning is often cultural or contextual, meaning that the phrase conveys an idea or sentiment that cannot be easily understood just by looking at the words alone. For example, the idiom "kick the bucket" refers to someone passing away, which is not related to the literal act of kicking a physical bucket. This unique characteristic of idioms makes them an interesting and vital part of language, as they add depth and color to communication. The other choices do not capture this essential feature of idioms.