Formulaic language (previously known as automatic speech or embolalia) is a linguistic term for verbal expressions that are fixed in form, often non-literal in meaning, with attitudinal nuances, and closely related to communicative-pragmatic context.
Along with idioms, expletives, and proverbs, formulaic language includes pause fillers (e.g., "Like", "Er", or "Uhm") and conversational speech formulas (e.g., "You've got to be kidding", "Excuse me?", or "Hang on a minute").
An idiom is a phrase or expression that largely or exclusively carries a figurative or non-literal meaning, rather than making any literal sense. Categorized as formulaic language, an idiomatic expression's meaning is different from the literal meanings of each word inside it.
Idioms occur frequently in all languages. In English alone there are an estimated twenty-five thousand idiomatic expressions. Some well known idioms in English are "spill the beans" (meaning "reveal secret information"), "it's raining cats and dogs" (meaning "it's raining intensely"), and "break a leg" (meaning "good luck").
In linguistics, a filler, filled pause, hesitation marker or planner is a sound or word that participants in a conversation use to signal that they are pausing to think but are not finished speaking. These are not to be confused with placeholder names, such as thingamajig. Fillers fall into the category of formulaic language, and different languages have different characteristic filler sounds. The term filler also has a separate use in the syntactic description of wh-movement constructions (see below).