David Appleyard's English Language User Guides and References
Index of Briticisms
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AmericanBritish BritishAmerican
Y-fronts™ Jockey™ briefs or shorts
yacht sailboat
Yale™ lock pin tumbler lock; cylinder lock
yob [back slang for 'boy'] lout, hooligan, ruffian
yomp march energetically, usually while laden with equipment
yonks [slang] (as in 'that was yonks ago') years, ages, a very long time
Yours faithfully (formal) In the UK, ends a business letter to an unknown recipient, one that would begin with "Dear Sir/Madam" or "To whom it may concern."
Yours sincerely Sincerely (yours)