芒刺在背的英文：
[Literal Meaning]
spike/at/back
to have spikes in the back

[解释]
好像后背上扎了很多刺。比喻内心紧张，坐立不安。

[Explanation]
to feel uneasy and nervous

[例子]
听到小丽揭露了他的谎言之后，韩亮感觉好像芒刺在背，头上也开始冒汗了。

[Example]
Hearing that his lies had been exposed by Xiao Li, Han Liang felt uneasy and nervous and sweat appeared on his forehead.

[英文等价词]
on pins and needles