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Widen
WordNet
verb
(1) Become broader or wider or more extensive
"The road widened"
(2) Make wider
"Widen the road"
(3) Make (clothes) larger
"Let out that dress--I gained a lot of weight"
(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"