To take a leaf out of [my] book. To imitate me; to do as I do. The allusion is to literary plagiarisms.
To turn over a new leaf. To amend one’s ways. The French equivalent is: “Je lui ferai chanter une autre chanson.” But in English, “To make a person sing another tune,” means to make him eat his words, or change his note for one he will not like so well.
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