wane

1. V-I If something wanes, it becomes gradually weaker or less, often so that it eventually disappears. 减弱; 减少

While his interest in these sports began to wane, a passion for lacrosse developed. 他对这些运动项目的兴趣开始减退的同时，对长曲棍球的兴趣却浓厚起来。