Nose  —n. 1 organ above the mouth of a human or animal, used for smelling and breathing. 2 a sense of smell. B ability to detect a particular thing (a nose for scandal). 3 odour or perfume of wine etc. 4 front end or projecting part of a thing, e.g. Of a car or aircraft. —v. (-sing) 1 (usu. Foll. By about, around, etc.) Pry or search. 2 (often foll. By out) a perceive the smell of, discover by smell. B detect. 3 thrust one's nose against or into. 4 make one's way cautiously forward.  by a nose by a very narrow margin.