Having a severely bent or twisted spine; hunched or deformed in the back.
Combination of the adjective crooked with the compound backed, creating an intensified or emphatic form; similar to how 'humpbacked' intensifies 'humped.'
The doubling effect in 'crookedbacked' (using both crooked and backed) shows how English redundantly stacks descriptors for emphasis—like saying 'very, very curved' to express severity.
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