To grow less; decrease.

减少；亏(尤指月而言)(away)。

To decline in power or importance; fail.

衰败；衰弱。

To approach the end.

接近终结。

The decrease of the visible bright part of the moon from full to new.

月亏(即由满月而变为新月)。

Decrease in power or importance; gradual failure.

衰落；消沈。

A period of decline.

衰落期。