As soon as Cindy got her new credit card, she immediately went on a shopping spree.

辛迪一拿到新的信用卡就开始毫不节制地购物。

spree 狂欢；恣意的行为

解说：spree 为不可数名词，指以享乐为本，且较为激进、无节制的行为。可译为「（短期无节制的）狂欢行为」。