the main written work, book, or document / the real written work, book, or document / this or the aforementioned or the relevant written work, book, or document

(kyabakura industry) visiting a kyabakura with a certain hostess in mind

pocket book, pocket edition

(grammar) a main verb

signed copy of a book

a surname

a surname

(law enforcement, slang) real culprit

(Internet slang) main account; main

Used other than figuratively or idiomatically: see 一 and 本 (one thing) / Short for 一本勝ち (ippon-gachi, “winning in one blow”).