The moon is waning when it is getting smaller
Waning.
Then the Moon is "waning".
When the light of the moon is getting smaller, it is said to be in its waning phase. This occurs after the full moon, as the visible illuminated portion decreases until it becomes a new moon. The waning phases include the waning gibbous and waning crescent stages.
waning
Waning.
When the moon appears to be shrinking, it is said to be waning. This phase occurs as the amount of illuminated surface visible from Earth is decreasing. It gradually transitions from a full moon to a new moon.
A "shrinking moon" refers to the phenomenon where the moon appears to be decreasing in size, usually during its waning phase. This is a natural occurrence as the illuminated portion of the moon visible from Earth decreases over the course of the lunar cycle.
Waning.
When the moon grows smaller, it is said to be waning. This is the period between the full moon and the new moon, when the visible portion of the moon decreases.
It is said to be waning, and waxing when the moon's light is increasing.
Waning gibbous, Third Quarter and Waning Crescent are the 'waning' moon phases.
The Moon appears to be waxing when it is transitioning from a new moon to a full moon, and waning when transitioning from a full moon to a new moon. Without specific information on the current lunar phase, it's not possible to determine if the Moon is waxing or waning at this moment.