"1963: Dead on this homecoming cue Jack came home, his hands sheerfree of salesman’s swink, ready for Enderby. — Anthony Burgess, Inside Mr. Enderby"
verb
°(archaic) to
labour, to work hard.
"1922: And on this board were frightful swords and knives that are made in a great cavern by swinking demons out of white flames that they fix in the horns of buffalos and stags that there abound marvellously. — James Joyce, Ulysses"