The idiom "tie the knot" means to get married. It is a common slang expression used to describe the act of two people getting married and becoming legally bound to each other.
The phrase "tie the knot" comes from the old tradition of tying a knot in a rope to symbolize the unity and commitment between two people. Nowadays, it is used to refer to the act of getting married, regardless of whether or not there is an actual knot involved.
You can use this idiom when you want to talk about someone getting married. For example, you might say, "My sister is tying the knot next month," or "I heard that John and Sarah are finally tying the knot after being together for so long."
Overall, "tie the knot" is a fun and informal way to talk about marriage, and it is commonly used in everyday conversation.
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