Definitions of narrow:

• noun:   a narrow strait connecting two bodies of water
• verb:   make or become more narrow or restricted

  Example: "The selection was narrowed"

• verb:   become tight or as if tight
• verb:   become more special
• verb:   define clearly

  Example: "I cannot narrow down the rules for this game"

• adjective:   limited in size or scope

  Example: "The narrow sense of a word"

• adjective:   not wide

  Example: "A narrow bridge"

• adjective:   very limited in degree

  Example: "Won by a narrow margin"

• adjective:   lacking tolerance or flexibility or breadth of view

  Example: "A brilliant but narrow-minded judge"

• adjective:   characterized by painstaking care and detailed examination

  Example: "A narrow scrutiny"

• name:  A surname (very rare: popularity rank in the U.S.: #69735)