Noun blank check has 2 senses
  1. free hand, blank check - freedom to do as you see fit; "many have doubts about giving him a free hand to attack"
    --1 is a kind of freedom
  2. blank check, blank cheque - a check that has been signed but with the amount payable left blank
    --2 is a kind of check, bank check, cheque
    --2 is a member of checkbook, chequebook
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