broaden
verb uk/ˈbrɔː.dən/ us/ˈbrɑː.dən/
(WIDER)
[ I or T ]（使）变宽；（使）变阔
to become wider, or to cause something to become wider
The track broadens and becomes a road at this point. 小道逐渐拓宽，到这里就成了一条马路。
They are broadening the bridge to speed up the flow of traffic. 他们正在拓宽大桥以提高通行能力。
(MORE GENERAL)
C1 [ T ]扩展；拓宽
to increase the range of something
They've introduced all sorts of new elements to that programme in order to broaden its appeal. 他们已经给那个节目加入了各种新元素以增强其吸引力。
I hoped that going to college might broaden my horizons (= increase the range of my knowledge and experience). 我希望上大学能使我增长见识。
broaden the/your mind 拓展（视野，思维）
to make someone understand more and know more about different subjects, ideas, places, etc.
They say that travel broadens the mind. 他们说旅行拓展思维。
The Internet can give children opportunities to broaden their minds. 互联网给儿童带来机会让他们拓展视野。
Do you suppose the trip broadened his mind in any way?
The vital thing about reading is that it broadens the mind.
I hoped that all these new experiences might broaden her mind.
Phrasal verb
broaden out 变宽
to become wider
The river broadens out around the next bend. 河流在下一个拐弯处变宽了。