Definitions of widen:

• verb:   become broader or wider or more extensive

  Example: "The road widened"

• verb:   make wider

  Example: "Widen the road"

• verb:   extend in scope or range or area

  Example: "Widen the range of applications"

• verb:   make (clothes) larger
• name:  A surname (very rare: popularity rank in the U.S.: #53403)