zhōng xīn gěng gěng忠心耿耿loyal and devoted (idiom); faithful and trueFrequency 2.8Meaningsloyal and devoted (idiom); faithful and trueExample sentences这位老管家为主人服务多年,一直忠心耿耿。他表面上忠心耿耿,暗地里却另有打算。