Related Clues:
- Open University refusal to admit daughter
- Open with part of Nessun dorma
- Ctrl Z, on a PC
- Computer command after a mistake
- Computer's "reverse" action
- Counterclockwise arrow icon
- Reverse the effect of
- Turn back the hands of time after a boo-boo
- Cancel, as a command
- Bring to ruin: loosen
- Gun dog bounds off, free
- Corrective computer command
- Declare legally invalid
- Ruin United Nations function
- Loosen, like a knot