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zigzag rule

noun
1.
a rule composed of light strips of wood joined by rivets so as to be foldable, all the opening and closing parts being in parallel planes.
Also called folding rule.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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Historical Examples
  • The inspector took a folding rule from his pocket and with it pointed out the traces.

    The Woman in Black Edmund Clerihew Bentley

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