Answers:
It means that by whatever it takes be it done forcefully by the hook or he'll have to bend some rules (crook) just to get it.
We woud say, whatever it takes.
This phrase derives its origin from the custom of certain manors where tenants are authorized to take fire-bote by hook or by crook; that is, so much of the underwood as may be cut with a crook, and so much of the loose timber as may be collected from the boughs by means of a hook.
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