wane
/weɪn; wen/ v[I]
1 (of the moon) show a gradually decreasing area of brightness after being full （指月亮）亏, 缺. Cf 参看 wax2 1.
2 gradually lose power or importance; become smaller or weaker or less impressive 衰败; 衰落; 变小; 变弱; 变差
The power of the landowners waned during this period. 这一时期地主的势力削弱了.
Her enthusiasm for the expedition was waning rapidly. 她对这次出行的热劲迅速减低.
3 (idm 习语) wax and wane => wax2. wane, n (idm 习语) on the `wane gradually decreasing; waning 逐渐减弱; 衰败; 衰落.