Answer: countermand

AnswerCrossword Clue
COUNTERMANDRevoke an order.
COUNTERMANDRescind
countermandRevoke (an order)
countermandRevoke an order issued by (another person)
countermandDeclare (voting) invalid
countermandto revoke an order by a contrary order
countermandCancel an order for (goods)