Define narrow. narrow synonyms, narrow pronunciation, narrow translation, English dictionary definition of narrow. adj. nar·row·er , nar·row·est 1. Of small or limited width, especially in comparison with length. Narrow means less wide or to make less wide. When you narrow down your choices, you decrease the number of choices. A road might be too narrow for a car. NARROW definition: of little breadth or width; not broad or wide; not as wide as usual or expected. See examples of narrow used in a sentence. NARROW definition: 1. having a small distance from one side to the other, especially in comparison with the length…. Learn more. 13 meanings: 1. small in breadth, esp in comparison to length 2. limited in range or extent 3. limited in outlook; lacking. Click for more definitions. NARROW meaning: 1. having a small distance from one side to the other, especially in comparison with the length…. Learn more. The meaning of NARROW is of slender width. How to use narrow in a sentence.