Definitions:

1. cancel, annul, or reverse an action or its effect verb
   • I wish I could undo my actions
2. cause to become loose verb
   • undo the shoelace

Synonyms:

• loosen
• unmake
• unwrap

NearBy Words:

• undoable
• undock
• undocumented
• undoer
• undogmatic
• undogmatical
• undoing
• undomestic
• undomesticated
• undone
• undoubtedly