unhitch(v = verb.contact) - unfasten or release from or as if from a hitch;
Antonym: hitch
Sample sentences: Somebody ----s something; Somebody ----s something PP

   To free from being hitched, or as if from being hitched; to unfasten; to loose; as, to unhitch a horse, or a trace. [1913 Webster]

unhitch, v.tr.
1 release from a hitched state.
2 unhook, unfasten.