downswing

n.向下挥动；下降（趋势）

The shaft of a players club broke during his downswing. 一名球员球杆的杆身在向下挥杆的时候折断了。

That's why his hips unwound so fast on the downswing. 这就是为什么向下挥杆的时候他可以那么快速地外展他的髋关节。

Your body must not sway to the left during the downswing. 下降时你的身体决不能向左摇晃。