1. To move on top of someone or something in a rolling motion, on wheels, or atop or in something with wheels on it. The van rolled onto his foot, breaking several bones. Our ball rolled onto our neighbor's lawn. She managed to her feet out of the saddle before the horse rolled onto her after the fall.

2. To cause someone or something to move on top of someone or something else in a rolling motion, on wheels, or atop or in something with wheels on it. In this usage, a noun or pronoun is used between "roll" and "onto." They rolled some large stones onto the tarp to keep it from blowing away. The paramedics had to roll him onto the bed from the stretcher.

3. To apply a coat of some substance onto someone or something with something that rolls. In this usage, a noun or pronoun is used between "roll" and "onto." You'll need to roll two or three coats of paint onto the wall before you get an even color. He rolled the deodorant onto his armpits.

4. To move or proceed onto some new task or activity. Make sure you check each article for errors before you roll onto the next one. We should be able to roll onto a new project by the end of the month.