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Y-fronts pl (plural only)
- (plural only, Britain, informal) Men's or boys' briefs that have a fly as part of an inverted Y formed by the seams.
- 2013, Mike Peyton, Mike Peyton’s Floating Assets, page 4:
- I did the latter, so in writing this I have put it on record that I am one of the few men who has spent Christmas Eve running across a Kentish marsh in his Y-fronts with two horses trotting after him in close company.