Green’s Dictionary of Slang

1. the residue of one’s funds; also fig. use as nearly dying [? knock-down money under knock-down n.].

1958		F. Norman Bang To Rights 137: When I was on the last knockings I tried to get my bird out earning again.
1980		Barltrop & Wolveridge Muvver Tongue 87: ‘On the last knockings’ or ‘hasn’t got long to go’ are for a fatal illness.

2. information, facts [knock-down n. (3)].

1995		J. Cameron Vinnie Got Blown Away 163: Ash someone tell you about it, Jimmy or Rameez or Sherry give you the knockings.
2002		J. Cameron Hell on Hoe Street 16: Not likely he tell your mum and dad all the knockings.