Dip and Roll
In chapter 1 of Great Expectations, Pip says " he gave me a most tremendous dip and roll". Here dip and roll means he seized little Pip and violently shook him forcing him down, and tossing him about. This he did to frighten the boy into obeying. In simple English it means "he grabbed me and gave me a violent shake, pushing me down and tossing me around."
The phrase dip and roll gives the convict's physical strength and Pip's terror. It is a picturesque way of rough intimidating handling of a child.
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