/ Dictionary / Index P plus fours: Meaning and Definition of Find definitions for: plus' fours' Pronunciation: [key] long, baggy knickers for men, introduced before World War I and worn until the 1930s for sports activities, esp. golf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. plus plush Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language