Translation guide
A dirk is a type of long thrusting dagger, historically associated with Scotland. In Japanese, it is usually referred to by loanwords or descriptive terms.
Referring to the traditional Scottish long dagger
The most common direct loanword for the Scottish dirk.
He collects Scottish dirks.
Descriptive term meaning 'Scottish short sword/dagger'.
I saw a Scottish dirk at the museum.
Generic English loanword for 'dagger', sometimes used for a dirk but less specific.
That dagger is a traditional Scottish weapon.