broaden
/ˈbrɔ:dn; `brɔdn/ v[I, Ip, Tn]
~ (out) (cause sth to) become broader （使某物）加宽; 变宽
He (ie His body) broadened out in his twenties. 他二十多岁时身躯变宽了.
The road broadens (out) after this bend. 经过这一弯处以後, 路就变宽了.
You should broaden your experience by travelling more. 你应该多到各地走走以增广见识.