- (transitive) To undo the action of marrying somebody.
- 1883, Anthony Trollope, Mr. Scarborough's Family:
- But there can be no doubt that John Scarborough and Ada Sneyd were married at Rummelsburg, and that it will be found to be impossible to unmarry them.
- 1909, Miles Franklin, Some Everyday Folk and Dawn:
- If you like to exercise your authority I'll run away and you can't unmarry me.