tie the knot

US /taɪ ðə nɑt/
UK /taɪ ðə nɑt/
"tie the knot" picture
1.

to get married

:
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After dating for five years, they finally decided to tie the knot.
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They're planning to tie the knot next spring.
:
tie someone (up) in knotsknottietie intie in withtie-inhair tie