Tie the knot (Short video)

The phrase of the day is: "Tie the knot"

• If two people tie the knot, they get married.
  [ --- They tied the knot in a romantic ceremony on the banks of a fjord. --- ]
  
• If two or more companies tie the knot, they join to become one company.
  [ --- The two airline companies finally agreed to tie the knot after last-minute haggling over ownership. --- ]