渐小 meaning in English

decrescence

Plain washers , reduced outside diameter
外径渐小平垫圈
The skate board was popular for a while but interest in it eventually tailed off
滑冰板曾一度很流行，但是人们对它的兴趣最终渐小了。
In order of decreasing wavelength ( distance between successive wave crests ) , electromagnetic radiation consists of radio waves , infrared rays , visible light , ultraviolet rays , x rays , and gamma rays
按照波长（两个相邻波峰间的长度）渐小的顺序排列，电磁辐射由这样一些辐射波组成，红外线、可见光、紫外线、 x射线和伽玛射线。