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The partner of page down: to move up through a document one screen at a time, with the Page Up key. Computer instructions only — nobody says this about a paper book.
往上翻頁（按 Page Up 鍵）
原始詞典資料2 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
Page Upnoun
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computingengineeringmathematicsA keyboard key that when pressed scrolls up to the previous page of content.
page upverb
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computingengineeringmathematicsTo scroll up to the previous page of content.
- When I paged up or down, the text would sometimes get mangled and duplicated.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。