flipback
noun [ C ] uk/ˈflɪp.bæk/ us/ˈflɪp.bæk/
（轻薄短小的）上下翻便携书
a style of book that is smaller than usual and that you open with the longer side towards you and read from the top of the page to the bottom, rather than from right to left
As you read the flipback, you move the pages upward rather than turning them to the left. 阅读上下翻便携书时，你往上翻动书页而不是往左翻。