overclouding

The sky began to overcloud in the early afternoon, so we moved the picnic under the pavilion.

午后天空开始布满乌云，于是我们把野餐搬到凉亭下。

用法提示：overcloud 作不及物动词，表示天空布满乌云、变阴暗。

If the mountains overcloud before noon, the guide usually cancels the climb.

如果中午前山上乌云密布，向导通常会取消攀登。

用法提示：overcloud 作不及物动词，指山峦被云层笼罩，天气转坏。

The horizon had overclouded by sunset, and the fishermen expected a stormy night.

日落时地平线已经乌云密布，渔民们预料将有一个暴风雨之夜。

用法提示：overcloud 作不及物动词，用于过去完成时，表示天色变得阴沉。