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broad‧en

1 [transitive] to increase something such as your knowledge, experience, or range of activities :
The course helps school-leavers broaden their knowledge of the world of work.
The course helps school-leavers broaden their knowledge of the world of work.2 [intransitive and transitive] to affect or include more people or things, or to make something affect or include more people or things [= widen, expand]:
Mr Mates said the party must broaden its appeal to younger voters.
Flynn's appeal broadened as the campaign continued into the summer months.
I want to broaden the discussion to other aspects of the problem.
Mr Mates said the party must broaden its appeal to younger voters.
Flynn's appeal broadened as the campaign continued into the summer months.
I want to broaden the discussion to other aspects of the problem.3 [intransitive and transitive] to make something wider or to become wider [= widen]:
Mark's smile broadened.
The council decided to broaden the pavement.
Mark's smile broadened.
The council decided to broaden the pavement.broaden out
phrasal verb
The river broadens out at this point.