Simple past tense and past participle of unyoke.(verb)
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Use "unyoked" in a sentence
"He just unyoked the oxen, an 'sat down under a tree, an' died there sitting up."
"While some of the men chopped sage-brush and we children carried it to the fires that were kindling, other men unyoked the oxen and let them stampede for water."
"There's a great subtext of the heavy hand of government, much of which was unyoked by Reagan and Clinton only to be rekindled under GW Bush and accelerated by Obama."