"there was a sag in the chair seat"
"His tongue lolled"
"The flowers wilted"
A slump in his posture, a little droop to his shoulders.
Some power supply droop.
Two cracked vases, from which red flowers drooped.
牛津高阶第八版
美国韦氏词典
Dictionary.com
Free Dictionary
维基百科 (自由的百科全书)