"broaden" in the verb sense
1. broaden
make broader
"broaden the road"
2. widen, broaden, 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"
3. diversify, branch out, broaden
vary in order to spread risk or to expand
"The company diversified"
4. broaden
become broader
"The road broadened"
Source: WordNet® (An amazing lexical database of English)
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