ㄏㄢˋhànㄕㄨˋshùㄆㄧˊㄈㄨˊ

  1. 蚍蜉螞蟻撼樹蚍蜉比喻高估自己實力·劉克莊·疇昔遭逢後身撼樹蚍蜉不自量。」

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