中英成语俚语800对017：背信弃义

　　背信弃义

　　Go back on a person.

　　To back out.

　　Play one false.

　　A breach of promise.

　　Go back on.

　　eg：He is a gentleman who will not go back on anybody.

　　反义词：忠心耿耿 As true as the dial to the sun.