Definition: The word "nonesuch" is a noun that refers to something or someone that is considered a model of excellence or perfection. It describes a person or thing that has no equal or match.
There are no well-known idioms or phrasal verbs that directly incorporate "nonesuch," but you may find phrases like "one of a kind" or "second to none" expressing a similar idea of uniqueness or excellence.
In summary, "nonesuch" is a word you can use to describe someone or something that is exceptional and has no equal. It's a way to express admiration for a person's skills or the quality of an object.