took advantage of
彼は私の年の若い事に付け込んだ。
He took advantage of my youth.
彼女は私の無知に付け込んだ。
She took advantage of my ignorance.
彼は彼女の親切に付け込んだ。
He took advantage of her kindness.
ジョンはビルの弱みに付け込んだ。
John took advantage of Bill's weakness.