The antonyms for the word "un-tying" are tying, fastening, knotting, securing, tethering, and binding. These words indicate the opposite meaning of untying, which means to loosen or release a knot or tie. Tying is the act of fastening or connecting two things together using a knot or a string. Fastening is to make something permanent by attaching or securing it. Knotting denotes the act of creating a knot, while securing involves ensuring that something stays in place. Tethering means to tie or link something to a fixed point, while binding indicates wrapping or connecting something firmly. Hence, using these antonyms with the opposite meanings can create a clear understanding of words in context.