"They untied the prisoner"
"undo the shoelace" "untie the knot" "loosen the necktie"
I climbed my vessel's lofty side; my train obeyed me, and the ship unty'd.
Though you untie the winds and let them fight Against the churches.
牛津高阶第八版
美国韦氏词典
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维基百科 (自由的百科全书)