To save up is to put money aside until you have enough. Save up for a car, save up all year.
The up matters, since it means saving towards something rather than saving in general. Saving up avoids the interest that borrowing costs, at the price of waiting.
1phrasesave upTo put money aside until you have enough.
“They save up all year for the two weeks in August.”
save up is a phrase.
Practised in Shopping & Money