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The Collaborative International Dictionary
Dirk knife

Dirk \Dirk\, n. [Ir. duirc.] A kind of dagger or poniard; -- formerly much used by the Scottish Highlander.

Dirk knife, a clasp knife having a large, dirklike blade.

Wiktionary
dirk knife

n. A clasp knife with a large blade like that of a dirk.