case knife

plural case knives

1. A knife carried in a sheath or case.

   he called for a Case-Knife, and applying the Edge of it to his Mouth, converted it into a musical Instrument

   1712 July 31 (Gregorian calendar), [Joseph Addison], “SUNDAY, July 21, 1712”, in The Spectator, number 570; republished in Alexander Chalmers, editor, The Spectator; a New Edition, […], volume VI, New York, N.Y.: D[aniel] Appleton & Company, 1853, →OCLC

   Synonyms: sheath knife

2. A large table knife of a kind formerly kept in a case.