tsundoku, sudoku and otaku

A loanword (also loan word or loan-word) is a word adopted from one language (the donor language) and incorporated into another language without translation.

You can probably guess from the title of this article that I'm writing about three Japanese loanwords today. There are a good number of Japanese loanwords in English: karaoke, karate, tsunami, typhoon, teriyaki, sake, sushi, manga, anime, tofu, emoji, origami, shiatsu, ramen, and wasabi make up just a partial list.

Tsundoku is a new loanword for me. It's one of those words that has a larger meaning - almost a lifestyle. It is used to mean acquiring reading materials but letting them pile up in your home without reading them. Related words are tsunde-oku meaning to pile things up ready for later and then leave them, and dokusho which means reading books. Tsundoku also seems to refer to those books ready for reading later when they are on a bookshelf or nightstand. As currently written, the word combines the characters for "pile up" (積) and the character for "read" (読) - a "reading pile."

The word dates back to the Meiji era (1868-1912) and appeared when someone, perhaps jokingly, took out that oku from tsunde oku and substituted doku (to read). Tsunde doku would be difficult to pronounce, so it was compressed into tsundoku.

I initially confused tsundoku with Sudoku, that logic-based number-placement puzzle that my wife plays every morning as a kind of meditation. No connection between the two words other than some letters. These puzzles are quite old, but for Westerners, they became familiar in the 19th century, and then in the late 1970s when they first appeared for Americans in puzzle books. At that time they were known as Number Place puzzles. In 1986, the Japanese puzzle company Nikoli published them under the name Sudoku, meaning "single number."

Otaku literally means “house" but in English and Japanese, the word is used to describe someone who spends a lot of their free time at home. In the original Japanese usage that meant home playing video games, reading manga and watching anime. In either language, this person has little or no interest in more social or outdoor activities. It isn't always considered a bad word to have attached to you since fans of anime and manga use it to describe others with similar interests.