Longman Dictionary of Contemporary English homepage

broaden

verb
     
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.
I'd like to work abroad to broaden my horizons (=learn, experience, or attempt new things).
Travel broadens the mind (=helps you to understand and accept other people's beliefs, customs etc).
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.
3 [intransitive and transitive] to make something wider or to become wider [= widen]:
Mark's smile broadened.
The council decided to broaden the pavement.

broaden out

phrasal verb
if something, especially a river or road, broadens out, it becomes wider [= widen out]:
The river broadens out at this point.

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