解釋
芒刺:指植物莖葉、果殼上的小刺或谷類殼上的細刺。如同有芒刺紮在背上。形容內心惶恐，坐立不安。(形容坐立不安的樣子) feel prickles down one's back -- feel nervous and uneasy; in a most embarrassed and uncomfortable position; as a thorn in one's flesh; like having prickles on the back; feeling uncomfortable; on pins and needles
出處
《蒲柳人家》:他本是個整天跑野馬的孩子，從早到晚關在家裏，難受得屁股下如坐針氈，身上像芒刺在背。