British English

Alexanda Kotey and El Shakee Elsheikh are said to have been members of the 'Beatles' which executed hostages in propaganda videos.
In my years of writing about British and American language and customs, "Don't say fanny" is probably my first instruction to Americans visiting the UK. "Fanny" isn't the only American word that can render a Brit gob smacked though.
There's a reason the Oxford English Dictionary and others update their contents several times a year and announce, with increasing fanfare, their new additions. In 2016 the OED added over a thousand new words, including bathroom stall, cheerlead, team-oriented and yoga pants - all of which sound decidedly American.
Americans! Are you unsure of the right British translation for words like 'pants', 'fall' and 'mailman'? Why, look no further