unhitch
From Longman Dictionary of Contemporary Englishunhitchun‧hitch /ʌnˈhɪtʃ/ verb [transitive] FASTEN/DO UP#to unfasten something that is joined to something else→ See Verb tableExamples from the Corpusunhitch• When business was slow; the butcher allowed his girls and Amelia to unhitch the two horses from the traces and ride.