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English definition of “widen”

widen

verb [I or T] uk   /ˈwaɪ.dən/ us  

widen verb [I or T] (DISTANCE)

B2 to become, or to make something greater in width: As it approaches the sea, the river begins to widen (out).

widen verb [I or T] (AMOUNT)

B2 to (cause something to) become larger or to include a larger amount or number: His eyes/smile widened. Why not widen the discussion to include the Muslim and Jewish points of view?
(Definition of widen from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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