Speech style is a term used to describe the manner in which someone speaks. It can refer to the use of certain words, phrases, and expressions, as well as the tone, volume, and speed of speech. The crossword solution for this term is 'IDIOM, ' which refers to a phrase or expression that has a figurative meaning that is different from its literal meaning. Idioms are often used to add color and interest to speech, and they are also used to convey a particular emotion or attitude.