IPA: /ˈpeɪstˌdaʊn/
KK: /ˈpeɪstˌdaʊn/
The part of a book's endpaper that is glued to the inside of the cover.
The pastedown helps to secure the pages of the book to the cover.
Pastedown → It is formed from "paste" (from Old French *paster*, meaning to spread or smear) and "down" (from Old English *dūn*, meaning a hill or slope). The word "pastedown" refers to a piece of paper that is pasted down to the inside cover of a book, typically at the bottom.
Think of 'spreading' ('paste') something 'down' ('down') to remember that a pastedown is a paper that is stuck to the bottom of a book cover.
No commonly confused words.