darbs, n.² — Green’s Dictionary of Slang

darbs n.²

[? backsl., the pips on a card resembles the brads or shoemakers’ rivets in the sole of a boot]

playing cards.

1937		E. Raymond Marsh 46: ‘Got the darbs all right, Sid?’ ‘You bet,’ answered Sid, and produced a dirty pack of cards.
1984		Partridge DSUE (8th edn) 291/1: C.19-20.