(verb). When members of the House of Commons and other debaters call out Spoke, they mean that the person who gets up to address the assembly has spoken already, and cannot speak again except in explanation of something imperfectly understood.
(noun). I have put my spoke into his wheel. I have shut him up. The allusion is to the pin or spoke used to lock wheels in machinery
When solid wheels were used, the driver was provided with a pin or spoke, which he thrust into one of the three holes made to receive it, to skid the cart when it went down-hill. The carts used by railway navvies, and tram-waggons used in collieries, still have a wheel “spoked” in order to skid it.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894