1.
Change a number to the closest whole number or the closest multiple of 10. For example, Rounding it off, I expect the new school addition will cost a million dollars.
2.
Also,
round out. Finish, complete, especially in a neat or perfect way. For example, They rounded off the dinner with a magnificent liqueur, or That stamp rounded out his collection. [Mid-1700s; variant,
mid-1800s] Also see
round out.