ㄆㄧˊㄈㄨˊㄏㄢˋhànㄕㄨˋshù

  1. 比喻不自量力參見蚍蜉撼大樹五代史平話··》:有人詩道北漢伐喪蚍蜉撼樹不知天戈鼠竄狼奔。』」不自量力螳螂以卵擊石泰山壓卵

lit. an ant trying to shake a tree, to overrate oneself (idiom)​