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lag-screw

[lag-skroo]
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verb (used with object)
  1. to fasten with a lag screw.
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lag screw

noun
  1. a heavy wood screw having a square or hexagonal head driven by a wrench.
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Origin of lag screw

First recorded in 1870–75
Also called coach screw, lag bolt.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for lag-screw

lag screw

noun
  1. a woodscrew with a square head
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Word Origin

from lag ³; the screw was originally used to fasten barrel staves
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012