The phrase "coin a phrase" means to invent or create a new phrase or expression. Its antonyms, on the other hand, are terms that convey the opposite connotation. Instead of creating a new saying, you can borrow or recycle existing ones. Furthermore, rather than coining a phrase, you might opt to use established or traditional terminology. Expressions that have been used for a long time are referred to as cliches or idioms. Additionally, instead of establishing your language or contributing to the rich tapestry of the English language, you might decide to remain quiet or use limited vocabulary. Therefore, the reverse words of "coin a phrase" are cliche, idiom, borrow, recycle, use established terms, remain quiet, and limited vocabulary.