The act of bending, curving, or making something not straight.
From 'crook' (to bend), derived from Old Norse 'krókr' (hook, bend), plus the '-ing' suffix that transforms verbs into their present participle form.
The Norse root 'krókr' also gave us the word 'hook,' and both share the same ancient idea of something bent—when Vikings traded with English speakers, their word for a fishing tool essentially merged with our word for bending, showing how trade creates linguistic mixing.
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