countermand

Noun
  1. is a type of: bid, bidding, command, dictation - an authoritative direction or instruction to do something
Verb
  1. 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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