| untag | (verb) to remove a metadata tag from an internet post | - |
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| untangle | (verb) become or cause to become undone by separating the fibers or threads of | Synonyms: unknot, unpick, unravel, unscramble |
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| (verb) release from entanglement of difficulty | Synonyms: disencumber, disentangle, extricate |
| unteach | (verb) cause to disbelieve; teach someone the contrary of what he or she had learned earlier | - |
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| (verb) cause to unlearn | - |
| unthaw | (verb) become or cause to become soft or liquid | Synonyms: dethaw, dissolve, melt, thaw, unfreeze |
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| untie | (verb) undo the ties of | Synonyms: unbrace, unlace |
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| (verb) cause to become loose | Synonyms: loosen, undo |
| untune | (verb) cause to be out of tune | - |
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| (verb) cause to lose one's composure | Synonyms: discomfit, discompose, disconcert, upset |
| untwine | (verb) undo what has been twined together | - |
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| untwist | (verb) cause to become untwisted | - |
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