成语 to tie the knot 意思是“结婚、喜结良缘”。这是一个既通俗又地道的英语表达。
I never thought Peter would tie the knot so young. He only left university a year ago.
The film star and the lawyer tied the knot in private in Venice.
短语 tie sb (up) in knots 表示一件事情使人困惑，把人给弄糊涂了。它也可表示一个人的表达不清楚。
He was trying to explain the difference between megabytes and megabits and he got so confused. He really tied himself up in knots.
The idea of leaving home is really tying me up in knots. I don't know if I'll be able to manage without my parents.