broaden/ˈbrɔːdən/
vt., vi.（使）变宽，（使）扩大His face broadened out into a grin.他咧开嘴笑了起来。
For college students to do a part-time job will broaden their outlook.打工使大学生开阔了眼界。
His face broadened out into a grin.他咧开嘴笑了起来。
The road broadens out at this point.这条马路在这里开始变宽。