If you widen something or if it widens, it becomes greater in measurement from one side or edge to the other. 使变宽; 变宽
verb [vt. 及物动词] （使）变宽，加宽；（使）扩展，程度加深，范围扩大；（尤因惊讶或恐惧而眼睛）睁大
They may have to widen the road to cope with the increase in traffic. 他们可能得拓宽这条道路以适应车辆的增多。
