我们都知道fair-weather friend就是“不能共患难的朋友”，那么foul-weather friend是什么意思

    呢？请看对话：

    A: Did you go shopping with Mary Saturday?

    B: No, I didn’t. I came to realize that she’s sort of a foul-weather friend. She asked me to go with her just because she wanted a ride.

    Note: The opposite of a fair-weather friend, a foul-weather friend only seeks you out if they have a problem, need a shoulder to cry on, or someone to watch their dog, but otherwise they act as if they don’t even know you. They’re only your chum when they’re glum. The phrase might also refer to those who would bring you down one way or another. Either way, you won’t want to have such a friend.