blue blood - someone from a noble or aristocratic family The art exhibition attracted many of the blue bloods in the town. blue in the face - to be exhausted and speechless You can argue with him until you are blue in the face but you will never change his mind. bog down - to slow down, to become stuck I quickly became bogged down with all of the work that I had to do. boggle (someone's) mind - to confuse or overwhelm someone The amount of waste in the city program really boggles my mind. boil down to (something) - to reduce something to its essential or main.
