ㄌㄡˋlòuㄔㄨchūㄇㄚˇㄐㄧㄠˇjiǎo

  1. 暴露真相漏洞西遊記·》:千千仔細萬萬小心現出嘴臉露出馬腳斯文。」文明小史·》:幸虧機警過人便曉得事情一一對答半日不致露出馬腳。」

to reveal the cloven foot (idiom)​; to unmask one's true nature, to give the game away