what with

• what with: ～などで

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• he was now so busy, what with Quidditch practice three evenings a week on top of all his homework
  （予習やら宿題やらに加えて週三回夕方にクィディッチの練習をやることになって、［ハリーは］すごく忙しかった）
  J. K. Rawling, Harry Potter and the Philosopher's Stone, Bloomsbury, p. 126