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brass tacks

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noun Informal.
  1. the most fundamental considerations; essentials; realities (usually used in the phrase get down to brass tacks).
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Origin of brass tacks

First recorded in 1895–1900
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for brass tacks

brass tacks

pl n
  1. informal basic realities; hard facts (esp in the phrase get down to brass tacks)
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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