'rack up' definitions:

Definition of 'rack up'

(from WordNet)
verb
Gain points in a game; "The home team scored many times"; "He hit a home run"; "He hit .300 in the past season" [syn: score, hit, tally, rack up]
verb
Place in a rack; "rack pool balls"
verb
Defeat thoroughly; "He mopped up the floor with his opponents" [syn: worst, pip, mop up, whip, rack up]
verb
Supply a rack with feed for (horses or other animals)