蚍蜉撼大树pí fú hàn dà shù释义lit. an ant trying to shake a big tree (idiom)fig. to overrate one's own strengthalso written 蚍蜉撼樹|蚍蜉撼树[pi2 fu2 han4 shu4]单字详解蚍pi蜉fu撼han大da树shu