Verb
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remove the outer cover or wrapping of
"Let's unwrap the gifts!"
"undo the parcel"
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cause to become loose
"undo the shoelace"
"untie the knot"
"loosen the necktie"
-
cause the ruin or downfall of
"A single mistake undid the President and he had to resign"
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deprive of certain characteristics
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cancel, annul, or reverse an action or its effect
"I wish I could undo my actions"