Abrek (Caucasian irregular warrior), partisan etc.
(derogatory) Caucasian native
В горах жил старый абрек с ружьём.
An old abrek with a rifle lived in the mountains.
Абрек скрывался от врагов много лет.
The abrek hid from his enemies for many years.
В песнях часто поют про смелого абрека.
Songs often tell of the brave abrek.