Source : WordNet®

round off
     v 1: make round; "round the edges" [syn: {round}, {round out}]
     2: bring to a highly developed, finished, or refined state;
        "polish your social manners" [syn: {polish}, {round}, {polish
        up}, {brush up}]
     3: express as a round number; "round off the amount" [syn: {round
        down}, {round out}, {round}]