1.turn one's back on sb.

从字面上解释,意思是"把自己的背对着某人".实际上这是指"不理会某人,或不肯给那个有困难的人任何帮助".

例如: I'll ever forgive my elder brother —— he turned his back on me and refused to lend me any help when I lost my job.

我永远也不会原谅我哥哥.当我失去工作的时候,他根本不肯帮忙,一点钱都不愿意借给我.



be fed up to the back teeth

意思是 extremely irritated and fed up with something or someone 烦透了某人或某事

例子:I'm fed up to the back teeth with my job.

我烦透了现在的工作.



have one's heart in the right place

从表面意思看就是“一个人的心在恰当的位置”，也就是“心肠好、善良”的意思。

例如: Tom looks very rough but his heart is in the right place.

汤姆看起来凶巴巴的,但是心肠很好.



have one's tongue in one's cheek

意思是:半开玩笑,调侃

I don't think he was serious when he said that. I think he probably had his tongue in his cheek.

我觉得他不是认真地。他可能是在开玩笑。