Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n.pl. Loose knickers bagging below the knees, worn formerly for sports.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Trousers that extend four inches below the knee, traditionally associated with sports, especially golf.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. men's baggy knickers hanging below the knees; formerly worn for sports (especially golf)

Etymologies

From the fact that they were four inches longer than ordinary knickers.
(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

  • Stenning heaved himself up out of the rear cockpit and jumped down; he was in plus fours and a flying helmet.

    Movie Night

  • We secured a table on the shady patioa great place, really, a place of peace; you could imagine Scotsmen in caps and plus fours sitting there a hundred years earlier.

    The Italian Summer

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