Rack Up Meaning

(idiomatic) to defeat severely, to thrash

Example:   At the start of the game, the referee racks up the red balls.
  Chelsea racked up another 3 points at home to Bolton.
2013, Daniel Taylor, Jack Wilshere scores twice to ease Arsenal to victory over Marseille (in The Guardian, 26 November 2013)[1]
  In between, Mesut Özil's penalty was saved and Arsenal racked up more chances than they would probably want to remember.
  rack up some opinions about the new shopping center.