ㄅㄧㄢˋㄕㄥㄓㄡˇㄧㄝˋbiànshēng‑zhǒuyè

变生肘腋
  1. 三國志正傳》:諸葛亮)​公安夫人生變肘腋肘腋胳肢窩)​進退。』」變生肘腋」,比喻事變發生身邊 大敵當前謹防變生肘腋」。

lit. calamity in one's armpit (idiom)​; a major coup happening on one's doorstep, trouble or danger in one's own backyard