Cordelia Hebblethwaite at the BBC:
There is little that irks British defenders of the English language more than Americanisms, which they see creeping insidiously into newspaper columns and everyday conversation. But bit by bit British English is invading America too.
“Spot on – it's just ludicrous!” snaps Geoffrey Nunberg, a linguist at the University of California at Berkeley.
“You are just impersonating an Englishman when you say spot on.”
“Will do – I hear that from Americans. That should be put into quarantine,” he adds.
And don't get him started on the chattering classes – its overtones of a distinctly British class system make him quiver.
But not everyone shares his revulsion at the drip, drip, drip of Britishisms – to use an American term – crossing the Atlantic.
“I enjoy seeing them,” says Ben Yagoda, professor of English at the University of Delaware, and author of the forthcoming book, How to Not Write Bad.
“It's like a birdwatcher. If I find an American saying one, it makes my day!”
Last year Yagoda set up a blog dedicated to spotting the use of British terms in American English.
So far he has found more than 150 – fromcheeky to chat-up via sell-by date, and the long game – an expression which appears to date back to 1856, and comes not from golf or chess, but the card game whist. President Barack Obama has used it in at least one speech.