widen
     v 1: become broader or wider or more extensive; "The road
          widened" [ant: {narrow}]
     2: make (clothes) larger; "Let out that dress--I gained a lot
        of weight" [syn: {let out}] [ant: {take in}]
     3: make wider; "widen the road"
     4: extend in scope or range or area; "The law was extended to
        all citizens"; "widen the range of applications"; "broaden
        your horizon"; "Extend your backyard" [syn: {broaden}, {extend}]
Source: WordNet® 2.0