Formal prose and kitchen-table talk draw on different stocks of expression. A colloquialism is an informal word or phrase typical of everyday spoken language rather than careful formal writing.

Colloquialisms include relaxed vocabulary, clipped forms, and idiomatic turns that signal casual solidarity. They vary by region and generation. A colloquial item in one era may later become standard or may sink into dated slang.

Writers use colloquialisms to create voice and realistic dialogue. Style guides discourage them in academic or legal prose where register consistency matters. Lexicographers label colloquial items so users can judge fitness for context.

• Informal expression of everyday speech
• Signals casual register and social closeness
• Varies by region and age
• Used selectively in writing for voice