Meaning of “broaden” - Learner’s Dictionary

broaden

verb [ I, T ] uk us /ˈbrɔːdən/
INCREASE

to increase or make something increase and include more things or people:

We need to broaden the range of services that we offer.
Travel broadens your mind.
WIDER

to become wider or make something become wider:

Her smile broadened and she began to laugh.

(Definition of “broaden” from the Cambridge Learner’s Dictionary © Cambridge University Press)