Tsundoku
The habit of acquiring books and letting them pile up unread. Not quite hoarding — more like optimistic collecting with good intentions.
Origin
From the Japanese tsundoku (積読), a Meiji-era portmanteau blending tsunde-oku (積んでおく, "to pile things up and leave them") with doku (読, "to read"). The earliest known usage, tsundoku sensei, appeared around 1879 as playful slang for a teacher who owned many books but never read them.
Everyday Use
It was a miniature epiphany for me when I realized that the hobby of acquiring books was very different and only superficially related to my hobby of reading books. This thick line of separation is helpful to recognize in other areas of our lives — drafting smart daily todos Is unrelated to executing those items, learning a new skill different from performing that skills, and making friends different from maintaining friendships. We would all do well to remember to give ourselves a break on thinking one always follows the other. Those books in the pile are not a sign of defeat, but of a hobby well-fed.