しらかわよふね・しらかわよぶね

白河夜船

表記・読み：白川夜船・白河夜舟・白川夜舟・しらかわよふね・しらかわよぶね

1. 1

   being fast asleep (and totally unaware of what is going on around one)

   expressions (phrases, clauses, etc.)yojijukugo
2. 2

   know-it-all manner

   expressions (phrases, clauses, etc.)