new moon

1. N-COUNT A new moon is the moon when it first appears as a thin curved shape at the start of its four-week cycle. The new moon is also the time of the month when the moon appears in this way. 新月[usu sing]

...the pale crescent of a new moon. ...一轮灰白的新月。

The new moon was the occasion of festivals of rejoicing in Egypt. 在埃及，新月是欢庆的节日庆典。