螳 ㄊㄤ ˊ táng 臂 ㄅㄧ ˋ bì 当 ㄉㄤ dāng 车 ㄔㄜ chē 螳 ㄊㄤ ˊ táng 臂 ㄅㄧ ˋ bì 當 ㄉㄤ dāng 車 ㄔㄜ chē a mantis trying to stop a chariot (idiom) to overrate oneself and attempt sth impossible also written 螳臂擋車|螳臂挡车[tang2 bi4 dang3 che1]