2. That which rubs; that which tends to hinder or obstruct motion or progress; hindrance; obstruction, an impediment; especially, a difficulty or obstruction hard to overcome; a pinch.
But here was the rub: Too often, in order to justify them, I had to take myself by the throat and choke myself until my eyes bulged and my tongue hung out and wagged like the door of an empty house in a high wind.