broaden · verb I or T /ˈbrɔːd.ən/Full view
C1 to increase or make something increase and include more things or people
Dictionary examples:

Going to college will broaden your interests.

Travel broadens your mind.

Learner example:

I mentioned the fact that such a presentation would broaden his mind and help him to strengthen his position in the company. (Certificate in Advanced English; C1; Polish)

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