The word 'through' is a simplex word of Old English origin, derived from the Proto-Germanic þurhw, meaning "through." This, in turn, can be traced back to the Proto-Indo-European root terə-, which carried the sense of "to cross over, pass through, overcome." The semantic journey is direct and robust: the core concept of moving from one side to the other has remained remarkably stable for millennia. The spelling evolved from Old English 'þurh' to Middle English 'thurgh' before settling into its modern form, while its grammatical functions expanded from a simple preposition to include adverbial uses.

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