WordNet (r) 3.0 (2006):
round off v 1: make round; "round the edges" [syn: round, round out, round off] 2: bring to a highly developed, finished, or refined state; "polish your social manners" [syn: polish, round, round off, polish up, brush up] 3: express as a round number; "round off the amount" [syn: round off, round down, round out, round]