Definition
A persistent source of irritation or trouble.
肉中刺
As a staunch advocate, he has been a thorn in the government's side for years.
作为一位坚定的倡导者，多年来他一直是政府的眼中钉。
That old car has been a thorn in his side, constantly needing repairs.
那辆旧车一直是他的一块心病，总是需要修理。
The neighbor's dog, with its constant barking, is a real thorn in our side.
邻居的狗不停地叫，真是我们的一大麻烦。