to find the correct alignment and send the cards into matching colored trays.
In general English, "stack away" functions as a synonym for "stash," "store," or "put away." It implies organizing a large number of items neatly into a designated space for long-term storage. stack away
While "stack away" is literal, related "stack" idioms carry different weights in conversation: to find the correct alignment and send the
Seasonality: "She decided to her winter clothes as spring approached". Meaning & Synonyms - Vocabulary.com
Stack away - Definition, Meaning & Synonyms - Vocabulary.com