undo is a crossword puzzle answer that we have spotted 23 times. Ruin Open Untie Annul Ctrl+Z Negate Loosen Release Counter Nullify Destroy Unfasten Overturn Counteract Bring to nought Reverse effect of Release fastening Open, as shoelaces Open up, as shoelaces cancel, in a document Ctrl-Z function on a PC Useful command for the error-prone party after one french menu option