Definition of "fash"

"I wouldn't fash masel' about them, miss. Them things be all wore out."

1897, Bram Stoker, “Chapter 6”, in Dracula, New York, N.Y.: Modern Library

“They,” said he, meaning the collops, “are such as I gave his Royal Highness in this very house; bating the lemon juice, for at that time we were glad to get the meat and never fashed for kitchen. Indeed, there were mair dragoons than lemons in my country in the year forty-six.”

1886 May 1 – July 31, Robert Louis Stevenson, Kidnapped, being Memoirs of the Adventures of David Balfour in the Year 1751: […], London, Paris: Cassell & Company, published 1886

The Butchers Here is an old Munich policeman — Wilhelm Frick with eyes like those of a fash.

1945, Information Bulletin‎, volume 5, numbers 66-131

It is not they, with their comfortable middle class speaking-tour and festival-circuit lives, who will put on the black and go punch a Nazi or bash a fash. No. It will be the vulnerable, overwhelmingly queer, poor youth [...]

2017, Katessa Harkey, The Peace of the Hall: Rules of Engagement for the New Witch Wars, page 90

Used to go down to London on bash-the-fash awaydays; turn up at National Front marches and give them a toeing.

1996, Ajay Close, Official and doubtful, UK: Random House

Five of our lads had just watched the riot police go into the Wellington and give the fash a kicking.

2012, Dan Todd, One Man's Revolution, Andrews UK Limited

The women in NP at the time were very good spotters and we had good access to intel, photos etc. on the fash.

2012, Dave Hann, Physical Resistance: A Hundred Years of Anti-Fascism, John Hunt Publishing