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plus fours

plural noun
  1. long, baggy knickers for men, introduced before World War I and worn until the 1930s for sports activities, especially golf.
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Origin of plus fours

First recorded in 1915–20; so called because four inches are added to the length of ordinary knickers to give the desired looseness
Related formsplus-foured, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for plus fours

plus fours

pl n
  1. men's baggy knickerbockers reaching below the knee, now only worn for hunting, golf, etc
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Word Origin

C20: so called because the trousers are made with four inches of material to hang over at the knee
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