ˋchìㄉㄢˇdǎnㄓㄨㄥzhōngㄒㄧㄣxīn

  1. 形容忠誠不二封神演義·》:赤膽忠心無能萬一。」三俠五義·五七》:一番赤膽忠心為國為民一派正氣威風。」忠心赤膽」。忠心耿耿

lit. red-bellied devotion (idiom)​; wholehearted loyalty, to serve sb with body and soul
(expr. idiom.)​ être dévoué corps et âme