a. [ See Colloqui. ] Pertaining to, or used in, conversation, esp. common and familiar conversation; conversational; hence, unstudied; informal;
His [Johnson's] colloquial talents were, indeed, of the highest order. Macaulay. [1913 Webster]
n. A colloquial expression, not employed in formal discourse or writing. [ 1913 Webster ]
v. t. To make colloquial and familiar;