droop

1. V-I If something droops, it hangs or leans downward with no strength or firmness. 下垂

Crook's eyelids drooped and he yawned. 尅魯尅的眼瞼垂了下來，打起了呵欠。

2. N-SING Droop is also a noun. 下垂

...the droop of his shoulders. …他肩膀的耷拉像。