countermand

Noun
  1. A contrary command cancelling or reversing a previous command (synset 107183137)
    is a type of: bid, bidding, command, dictation - an authoritative direction or instruction to do something
Verb
  1. Cancel officially (synset 200801460)
    "He revoked the ban on smoking"; "lift an embargo"; "vacate a death sentence"
    is a type of: cancel, strike down - declare null and void; make ineffective
    subtypes: go back on, renege, renege on, renegue on - fail to fulfill a promise or obligation
    same as: annul, lift, overturn, repeal, rescind, reverse, revoke, vacate

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