Answer: broadens

AnswerCrossword Clue
BROADENSWhat travel does.
BROADENSMakes wider.
BROADENSWidens
BROADENSEnlightens
BROADENSExpands, in a way
broadensExpand to encompass more people, ideas, or things
broadensBROADEN, to make wider (extending far)
broadensBecome larger in distance from side to side; widen