broaden

verbs

make broader
"broaden the road"
is a type of (narrower)
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"
causes
become broader
"The road broadened"
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"
vary in order to spread risk or to expand
"The company diversified"
become broader
"The road broadened"
is a type of (narrower)
become bigger or greater in amount
"The amount of work increased"