widen/ˈwaɪdn; `waɪdn/ v[I, Tn](cause sth to) become wider （使某物）变宽; 加宽; 放宽 The road is being widened.这条路正在拓宽. He wants to widen his knowledge of the industry. 他想扩充自己在这一行业的知识.
牛津英汉双解词典