Meaning of "to finally tie the knot"?

[Lommi]

English Grammar Tests, Elementary Level

ESL/EFL Test #120 "Conversations and Comprehension (2)", question 10

Customer: Hi. I want a flight and hotel package for two to Las Vegas next month.
Travel Agent: OK. Is that for two adults?
Customer: Yes, my fianc and I are going to finally tie the knot.
Travel Agent: Oh, congratulations. How exciting!
Why is the customer going to do in Las Vegas? ..........

(a) He wants to gamble the whole time.
(b) He's going to get married.
(c) He wants to see some fabulous shows.

English Grammar Tests, Elementary Level

ESL/EFL Test #120 "Conversations and Comprehension (2)", answer 10

Customer: Hi. I want a flight and hotel package for two to Las Vegas next month.
Travel Agent: OK. Is that for two adults?
Customer: Yes, my fianc and I are going to finally tie the knot.
Travel Agent: Oh, congratulations. How exciting!
Why is the customer going to do in Las Vegas? He's going to get married..

Correct answer: (b) He's going to get married.
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WHAT IS MEANING OF " to finally tie the knot"?

Lommi

[Torsten]

It means to get married.
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Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary

[Nathanael86]

Hey,

I'm quite sure I've spotted two mistakes in the conversation: 1) I think it has to be "fiancée" instead of "fianc" and 2) Either "What is the customer going to do in Las Vegas?" or "Why is the customer going to Las Vegas?

Since this forum attaches great importance to correctness and precision I think they should be corrected unless of course I'm wrong!

[Esl_Expert]

Hello Nathanael86,

Torsten makes it a point to regularly remind forum members about sentence basics such as correct capitalization, punctuation and spelling. So it does seem that correctness and precision are important here, doesn't it?

[Torsten]

Hi Amy and Nathan,

Thank you very much for your great support. Of course we'll remove those typos as soon as possible.
Best regards,
Torsten
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Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary