(of a machine) To intentionally let the ball fall down to the drain by disabling flippers and most targets, done as a punishment to the player when the machine is nudged too violently or frequently.
Having the property that it is the quotient of a projective module by a projective submodule, having an ext functor with itself of 0, and there being a right module as the kernel of a surjective morphism between finite direct sums of its direct summands.