蚍蜉撼大树（蚍蜉撼大樹）　

◎ 蚍蜉撼大树 pífú hàn dàshù

(1) [an ant trying to shake a big tree—ridiculously overrating one‘s own strength;futile effort] 撼:摇动。蚂蚁想摇动大树。比喻不自量力

蚍蜉撼大树,可笑不自量。——唐· 韩愈《昌黎先生集》

(2) 亦作“蚍蜉撼树”