One antonym for "coining a phrase" could be "using a cliche." A cliche is an overused phrase or expression that has lost its original meaning or impact. Instead of creating a new and unique phrase, using a cliche could suggest a lack of creativity or originality. Another antonym could be "quoting a famous line." Quoting a well-known line or phrase from a book, movie, or speech may not involve creating something new but rather relying on someone else's words for impact. In contrast, coining a phrase requires creativity and a unique perspective to create a new term or expression.