broaden

sense 1: make broader; "broaden the road"
broaden

sense 2: 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"
widen broaden extend

sense 3: vary in order to spread risk or to expand; "The company diversified"
diversify branch_out broaden

sense 4: become broader; "The road broadened"
broaden