transitive. To loose, untie (a knot); also figurative to solve (a riddle).

To sunder, dissolve, break up (a state or condition of union); to undo, unfasten (a knot or tie).

transitive. To disentangle.

transitive. To undo (a knot). Also: to tie again; to tie tightly. Cf. renode, v.

To cause to slip or lose hold; esp. to undo (a knot) in this way. Also in figurative context.