IDIOM

[noun] [C] - a group of words in a fixed order having a particular meaning, different from the meanings of each word understood on its ownTo "have bitten off more than you can chew" is an idiom that means you have tried to do something which is too difficult for you.The idiom of a particular person, place, or style of music, art, building, etc. is their particular and typical style of expression.They hoped their brave action would, in the Marxist idiom, "bring about a proletarian revolution." ?The opera is very much in the modern idiom.