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1. Lit. [for something] to continue rolling. The ball rolled on and on. The cart came rolling down the hill and rolled on for a few yards at the bottom.
2. Lit. [for something] to be applied by rolling. This kind of deodorant just rolls on. She rolled on too much paint and it dripped from the ceiling.
3. Fig. [for something, such as time] to move on slowly and evenly, as if rolling. The years rolled on, one by one. As the hours rolled on, I learned just how bored I could get without going to sleep.