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Wiktionary
round off

vb. 1 To change the shape of an object to make it more circular. 2 (context mathematics English) To change a number into an approximation having fewer significant digits. 3 To complete or finish something.

WordNet
round off
  1. v. 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]

Usage examples of "round off".

He'd been after it for years-wanted it to round off his own place.

The carbine's barrel slammed the roof support, jarring the round off wildly into the empty night.