If there is gathering darkness, the light is gradually decreasing, usually because it is nearly night.
The lighthouse beam was quite distinct in the gathering dusk.
灯塔的光柱在渐暗的黄昏中清晰可见。
gatherings
A gathering is a group of people meeting together for a particular purpose.
the twenty-second annual gathering of the South Pacific Forum.
第22届南太平洋论坛年会。