Question

wane 【wane】v(月)亏；减弱The moon was waning, and in such a waning light, it is very difficult to see the enemy.月亮渐亏，而在这如此暗弱的光下，很难看见敌人。

Accepted Answer

[weɪn] 
wanea gradual decline (in size or strength or power or number)
Things that wax and wane grow larger and smaller, like the moon. Things that wane simply grow smaller. "My initial enthusiasm for helping waned when I saw the pile of envelopes that needed licking."
You may have heard the expression "on the wane." It means a fad, or a fashion, or a disease, that is on its way out the door. "The face mask fad at school was on the wane as new reports of kids infected with a dreaded new fly virus waned."
All forms of 'wane' will appear on average once every 886 pages.wanewaning

Front	wane
Pron	[weɪn]
Back	【wane】 v(月)亏；减弱 The moon was waning, and in such a waning light, it is very difficult to see the enemy. 月亮渐亏，而在这如此暗弱的光下，很难看见敌人。
Vocab	wanea gradual decline (in size or strength or power or number) Things that wax and wane grow larger and smaller, like the moon. Things that wane simply grow smaller. "My initial enthusiasm for helping waned when I saw the pile of envelopes that needed licking." You may have heard the expression "on the wane." It means a fad, or a fashion, or a disease, that is on its way out the door. "The face mask fad at school was on the wane as new reports of kids infected with a dreaded new fly virus waned." All forms of 'wane' will appear on average once every 886 pages. wane waning

Wane Things Grow Weɪn V(月)亏；减弱 Moon Waning Light