Definition of "knockemdowns"

'O, never fear,' carelessly; 'I'll have a turn at the knockemdowns, and one glass of ale in the booth, and then I'm your man.'

1874, Belgravia: A London Magazine, volume 24, page 325

In knockemdowns and bowls ten pins are used, the centre one being called the king, and the ball has to be grounded before it reaches the frame.

1878, John Henry Walsh, British Rural Sports, page 712