rack

mastery
/ɹæk/nounverb

card 1 of 10 · idiom meaning

What does the idiom 'rack up' mean in the sentence: 'At the start of the game, the referee racks up the red balls.'?

What does the idiom 'rack up' mean in the sentence: 'At the start of the game, the referee racks up the red balls.'?