搭配 “have a dead leg/arm” 的意思是 “腿部或手臂因血液不流通而暂时失去知觉，感到麻木、不能移动”。

人们 “have a dead leg/arm” 的原因可能是身体局部长时间保持同一个动作，血液不流通，从而感到麻木。“Have a dead leg/arm” 也可以用来表示在足球等接触式运动中突然被击中，从而造成的 “腿部或手臂一下子失去知觉” 的症状。

在使用时，既可以说：“I have a dead leg/arm.”，也可以说：“My leg/arm has gone dead.” 我的腿/胳膊没感觉了。

例句
The footballer struggled to get back on his feet after he was tackled as his leg had gone dead.
这位足球运动员被阻截后，挣扎地想站起来，因为他的腿暂时失去了知觉。

I was sat cross-legged for too long and now I have a dead leg.
我盘腿坐了太久，现在一条腿麻了。

After I had the injection, my arm was dead – I couldn’t pick up my coffee cup.
我打完针之后，胳膊没感觉了。我连咖啡杯都拿不起来。