untier

/ʌnˈtaɪər/
noun
  1. A person or thing that unties something (undoes a knot, lace, or fastening).
    • This tool is a perfect untier for stubborn knots in garden hoses.
    • My little sister is a quick untier of shoelaces, so she helps the kindergarteners.
    • The sailor was a skilled untier of even the most tangled ropes.
  2. A person who resolves a problem, puzzle, or complicated situation.
    • In the mystery novel, the detective is the ultimate untier of the plot's many secrets.
    • She is known as an untier of complex legal cases that others give up on.
    • The mediator acted as an untier of the long-standing dispute between the two neighbors.
Antonyms