I wouldn't put anything past sb

• I wouldn't put anything past sb: 人（sb）なら何だってやりかねない

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• I'm with Harry. I wouldn't put anything past Snape.
  （僕もハリーと同意見だ。スネイプなら何だってやりかねないよ。）
  J. K. Rawling, Harry Potter and the Philosopher's Stone, Bloomsbury, p. 135