- - Going down.
- - becoming less visible, as the moon
- - Moon phase that's the reverse of waxing
- - Decreasing in power
- - Dwindling.
- - Becoming new, in a way
- - Losing intensity
- - Gradually decreasing in size
- - Decreasing in intensity
- - Diminishing
- - Like a last-quarter moon
- - Approaching the third quarter, say
- - Declining in power
- - Like some moons
- - Petering out
- - Growing faint.
- - Declining
- - In decline
- - On the decline
- - On the way out
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