Dirk n. A kind of dagger or poniard; -- formerly much used by the Scottish Highlander.
Dirk knife, a clasp knife having a large, dirklike blade.
Dirk, v. t. [imp. & p. p. Dirked p. pr. & vb. n. Dirking.] To stab with a dirk.
Dirk, v. t. To darken. [Obs.]
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dirk
n : a long dagger with a straight blade