Final answer:
A colloquial or colloquialism is an informal or everyday expression used in common, everyday speech. It is specific to a dialect spoken by a specific community or used by a larger speech community sharing a common vocabulary and grammar.
Step-by-step explanation:
A colloquial or colloquialism is an informal or everyday expression used in common, everyday speech. It is not a formal way of speaking or a type of written language. Colloquialisms can be specific to a dialect spoken by a specific community or used by a larger speech community sharing a common vocabulary and grammar.