untie - definition and synonyms

verb [transitive] 

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present tense
present participleuntying
past tenseuntied
past participleuntied
  1. to take the knot out of a piece of rope or string that fastens something

    He learnt to tie and untie his shoes.

    Can you untie the knots in this rope?

    1. a.
      to let a person or animal go free by untying the rope that is keeping them somewhere