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1. To eliminate the decimals from a fraction in order to create a whole number, either by moving to the next lowest number when the decimals are less than one half, or moving up the next highest number when the decimals are greater than one half. A noun or pronoun can be used between "round" and "off." Please round off the figures used in your return, as failure to do so may result in delay to it being processed correctly. You can't just round the number off like that—it has to be exact!
2. To finish or complement something, especially in a perfect or appropriate way. A noun or pronoun can be used between "round" and "off." We rounded off the evening with a lovely walk through Central Park. I actually think it's nicer to round a meal off with a selection of cheeses, rather than a dessert.
round something off (with something)
to finish something with something; to complement something with something. We rounded the meal off with a fine cognac. We rounded off the meal with a sinful dessert.
round something off
to change a number to the next higher or lower whole number. (See also round off to something.) You should round 8.122 off. I rounded off 8.789 to 9.
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.