#1 broaden v. make broader; "broaden the road". wn
#2 broaden v. [widen, extend] 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". wn
#3 broaden v. [diversify, branch out] vary in order to spread risk or to expand; "The company diversified". wn
#4 broaden v. become broader; "The road broadened". wn
vizzz