白河夜船 しらかわよふね Also written しらかわよぶね, 白川夜船, 白河夜舟, 白川夜舟 Meanings Expression being fast asleep (and totally unaware of what is going on around one) know-it-all manner Kanji 白 white. Read as しら. 河 river. Read as かわ. 夜 night 船 ship. Read as ふね. Word lists Yojijukugo (四字熟語) Jinuma: Japanese Dictionary · Word lists