1. （使）变宽;（把…）加宽
    If you widen something or if it widens, it becomes greater in measurement from one side or edge to the other.

widen

    e.g. He had an operation last year to widen a heart artery...
           去年他接受了一个扩张心脏动脉的手术。
    e.g. The river widens considerably as it begins to turn east.
           河流转向东流时河道大幅度变宽。

2. (使)扩大;(使)扩展;(使)增加
    If you widen something or if it widens, it becomes greater in range or it affects a larger number of people or things.

widen的意思

    e.g. U.S. prosecutors have widened a securities-fraud investigation...
           美国检察官扩大了对一起证券欺诈案的调查范围。
    e.g. The search for my brother widened...
           对我弟弟的搜索范围扩大了。

3. (眼睛)睁大
    If your eyes widen, they open more.

    e.g. His eyes widened as he spoke the words.
           他说这番话时眼睛瞪大了。

4. (使)(差距)拉大
    If a difference or gap widens or if something widens it, it becomes greater.

    e.g. Wage differences in the two areas are widening...
           两个地区的工资差距正在拉大。
    e.g. The US trade deficit widened to $7.59 billion in November.
           11月美国的贸易赤字扩大到75.9亿美元。