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Verb: tie the knot
Usage: informal
  1. Take in marriage
    "After dating for years, they finally decided to tie the knot";
    - marry, get married, wed, conjoin [formal], hook up with [informal], get hitched with [informal], espouse [archaic], hitch up [informal], get hitched [informal]

Derived forms: ties the knot, tying the knot, tied the knot

Type of: unify, unite