slobber-knocker n. especially in American football, a powerful collision or a match featuring unusual phsyical violence or intense play; (hence) also in other sports, an exciting game; an exciting or emotional event. Also v., slobber-knock, to hit...
hard knocker n.— «A hard knocker in racetrack parlance is a horse who races consistently with determination, regardless of circumstances.» —“Lone Star Park Notes” by Gary West in Grand Prairie Star...
knob knocker n.— «“Imagine a razor shaving your face, but on a much bigger scale,” says Shawn McKinney, president of the Springfield Area Mountain Bike Association about the knob knocker, a device created to shave the bumps off a...