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S twist

American  

noun

  1. a direction of the twist in yarns, from top left to bottom right, resembling the long stroke of the letter S.

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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.