控え
  扣え
  ひかえ
  noun (common) (futsuumeishi)
  reserve
  spare
  backup
  note
  memorandum
  noun (common) (futsuumeishi)
  noun, used as a suffix
  duplicate
  copy
  stub (of a ticket, etc.)
  noun (common) (futsuumeishi)
  waiting one's turn
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