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line trimmer

American  

noun

  1. a gardening device used to trim the edges of lawns by means of a rapidly rotating motor-driven flexible wire or cord.

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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.