Here is a context clues worksheet on the verb countermand. It means “to revoke (a command) by a contrary order” and “to recall or order back by a superseding contrary order.” It is only used transitively, so don’t forget to countermand something.
It’s only used transitively. If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.