As with any language, American English is full of idioms, especially when spoken. Idioms add color and texture to language by creating images that convey meanings beyond those of the individual words that make them up. Idioms are culturally bound, providing insight into the history, culture, and outlook of their users. This is because most idioms have developed over time from practices, beliefs, and other aspects of different cultures. As a culture changes, the words used to describe it also change: some idioms fall out of use and others develop to replace them. With idioms in particular, the beliefs or practices leading to their use may disappear while the idiom itself continues to be used. Idioms can be so overused that they become cliches; or they can become slang or jargon, expressions used mainly by specific groups or professions."