1. Verb, passive, intransitive: For a ball to be pocketed. "The 8 ball fell early, so the game was over quickly."
2. Noun: The curved edge cut into the table bed at which the hole of the pocket actually begins inside the pocketjaws. The fall may be a sheer drop, as on tournament-standard snooker tables, or have a beveled, down-sloping rim, as on pool tables. A ball is, of course, much more likely to hang when there is no bevel. How far into the pocket the fall begins is one factor that determines "pocket speed" or difficulty.