put one's foot in to it
A:Do you know that Mary and Ben have already separated?
A:你知道玛丽和本已经分手了吗?B:Yeah, I know.
B:是的，知道。
A:I didn't know it until yesterday. I put my foot in to it, and was even stupid enough to ask when they would get married.
A:我昨天才知道，我还傻乎乎地得问他们什么时候结婚呢。