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undo [undid, undone, undoing, undoes]▼(to unfasten)verb[UK: ʌn.ˈduː] [US: ʌn.ˈduː]
untie [untied, untying, unties]▼(to loosen, as something interlaced or knotted)verb[UK: ʌn.ˈtaɪ] [US: ʌn.ˈtaɪ]
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