broaden | WordDisk

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• become larger in distance from side to side; widen.

• "her smile broadened"

Similar: widen, become/make broader, become/make wider, expand, fill out, stretch (out), draw out, spread out, deepen, thicken,

Opposite: narrow,

• expand one's range of interests, activities, and knowledge.
"they want to broaden their horizons with a change of scenery and culture"