1 joined at the hip

连体婴（死党）

They are joined at the hip. = They are really good friends and they always seem to be together.

他俩是死党，好像总在一起。

例子：If we invite Doug to the party, then Nikki will come too because they are joined at the hip.

要是我们邀请道格，那么妮姬也会来。 这两个人是从来不分开的。

1 one foot in the grave

一只脚已经入了坟（入土三尺）

He has one foot in the grave. = He is very old and will probably die soon.

他年事已高，活不长了。

例子： A man at his age and in his health should not be trying to go skiing. He already has one foot in the grave, skiing could kill him.

一个人到了他这把年纪和这个健康状况，就不该去滑雪。他都入土三尺了，滑雪会要了他的命。

1 low blow

不正当的攻击，下流手段

That was a low blow. = That was unfair and inappropriate to say or to do.

那么说或者做是既不公平也不正当的。

例子：Although you were in the middle of an argument, it was really a low blow to reveal you friend's secret in front of everyone.

纵然争论中不免愤怒，你那么当众揭发你朋友的隐私也还是不正当的。