Plural of crookery; instances of crooked or dishonest behavior; dishonest dealings or tricks.
From crookery (dishonest behavior) plus the plural -s suffix, though the singular is quite archaic.
Crookeries is a wonderful example of a word so old it's barely remembered—you can construct it logically from 'crookery,' but you'd never hear it in modern English where we simply say 'dishonesty' or 'fraud.'
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