What does 投書 mean?
投書 is a Japanese noun meaning “letter to the editor, letter from a reader, contribution” in English. It can also be translated as “contribution (to a newspaper, magazine, etc.)” depending on context. It is written as 投書 in kanji, とうしょ in hiragana, and tousho in romaji. This word is part of JLPT N2 vocabulary.