Compound of 積む (tsumu, “to pile up”) + 読 (doku, “to read, reading”, on'yomi), punning on 積んどく (tsundoku), contraction of 積んでおく (tsunde oku, “to leave piled up”).
積ん読 • (tsundoku)
- (informal) the act of leaving a book unread after buying it, typically piled up together with other such unread books
- ^ 1988, 国語大辞典（新装版） (Kokugo Dai Jiten, Revised Edition) (in Japanese), Tōkyō: Shogakukan
- ↑ 2.0 2.1 2006, 大辞林 (Daijirin), Third Edition (in Japanese), Tōkyō: Sanseidō, →ISBN
- ^ Coleman, Libby (8 October 2016), “There's a word for buying books and not reading them”, in OZY, retrieved 9 October 2016