have half a mind to do

• have half a mind to do: よっぽど何かをしようかと思う

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• he had half a mind to ask Wood to call time out
  （よっぽどウッドに言ってタイムをとってもらおうかと思った）
  J. K. Rawling, Harry Potter and the Philosopher's Stone, Bloomsbury, p. 139