The word "zig-zag" is a reduplication, a common linguistic process where a word or syllable is repeated with a slight alteration. It entered English in the early 18th century from French zigzag, which itself was borrowed from German Zickzack. The German term is believed to be an onomatopoeic or symbolic formation, imitating the visual pattern of alternating sharp angles. It likely derives from the repetitive, jagged sound-symbolism of "zick" and "zack," representing successive turns. This vivid, imitative construction directly mirrors the physical shape it describes, evolving from a descriptive sound pattern into a standard term for any path or pattern characterized by sharp, alternating deviations.

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