save (something) up
phrasal verb with save verb uk/seɪv/ us/seɪv/
A2 储蓄，存（钱）
to keep money so that you can buy something with it in the future
It took me months to save up enough money to go travelling. 我用了几个月的时间才攒够了钱去旅游。
She's saving up for a new bike. 她正在存钱，想买一辆新自行车。