1. Cancel, annul, or reverse an action or its effect
   "I wish I could undo my actions" 
2. Deprive of certain characteristics
   - unmake 
3. Cause the ruin or downfall of
   "A single mistake undid the President and he had to resign" 
4. Cause to become loose
   "undo the shoelace"
   - untie, loosen 
5. Remove the outer cover or wrapping of
   "undo the parcel"
   - unwrap

Derived forms: undid, undoes, undoing, undone

See also: undoer, undoing

Type of: alter, change, change by reversal, expose, modify, reverse, ruin, turn, uncover

Encyclopedia: Undo

• on the way
• on the whole
• on the wing
• on thin ice
• on time
• on top of the world
• on tour
• on trial
• on your guard
• on-key
• on-license
• on-line database
• on-message
• on-off switch
• on-screen
• on-site
• on-street
• on-the-job
• on-the-scene
• onager
• Onagraceae
• onanism
• onanist
• once
• once again