The term 'SECOND TO NONE' is an idiom that means to be the best or superior to all others. It is often used to describe someone or something that is of the highest quality or excellence. The crossword solution for this term is 'NONE', which is a four-letter word meaning not any or no one. This phrase is often used to emphasize that something is the best or of the highest quality, as it implies that there is nothing better than it.