on the wane and on the wax 成语
on the wane and on the wax|on|wane|wax
adv. phr. Decreasing and increasing.

Said of the moon.
The moon is regularly on the wane and on the wax at regular intervals lasting half a month.on the abate and on the wax|on|wane|wax
adv. phr. Decreasing and increasing.

Said of the moon.
The moon is consistently on the abate and on the wax at approved intervals abiding bisected a month. Dictionary