Picture a pen going forward, stopping, cutting back the other way, then cutting back again — sharp corners, never curves. Line up those corners and you get a row of Z shapes. Every use of zigzag can be thought of as that same shape, seen either as a line, as a way of moving, or as a description of something.
From the word’s history
Attested from 1712, borrowed from French zigzag; possibly from a Germanic source, and possibly taken from the shape of the letter Z, which appears twice in the word.
大約 1712 年進入英文，借自法文 zigzag。來源有幾種說法：可能來自日耳曼語系，也可能直接取自字母 Z 的樣子——這個字裡剛好有兩個 Z。
Wiktionary entry for zigzag (kaikki extract supplied in evidence packet): "Attested from 1712. Borrowed from French zigzag... possibly from the shape of the letter Z, which appears twice in the word."
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