From Agatha Christie's "The Murder on the Links"(1923):
"Now I am old-fashioned. I have no patience with the modern neurotic girl who jazzes from morning till night, smokes like a chimney, and uses language which would make a Billings-gate fishwoman blush!"
But in this case, Alek's the one blushing. As a soldier and as the daring person she is, Deryn sure would swear quite a bit... Alek wouldn't, I reckon. I stand with him on that one c: