noun · a long rope with a sliding loop at one end, used for catching cattle or other animals

那位牛仔挥舞着套索，准确地套住了一头小牛。

noun · a loop of rope with a slipknot that tightens as the rope is pulled, used for trapping or binding

陷阱里的套索紧紧地勒住了猎物的腿。