a relatively long dagger with a straight blade
"The museum guard carefully secured the ancient dirk behind glass before opening it to visitors."
A long Scottish dagger with a straight blade.
"The museum curator explained that the ancient artifact displayed was an authentic dirk, a long Scottish dagger featuring a distinctively straight blade."
To stab with a dirk.
"The intruder lunged forward and tried to stab him in the chest with his shiny dirk, but he managed to block the blow just in time."
A male given name from German or Dutch, equivalent to English Derek.
"Dirk was thrilled when his new roommate introduced himself as Dirk too, a funny coincidence for two guys sharing the same German nickname."