Cossack

 Longman Dictionary of Contemporary English Online朗文当代英语 5++LDOCE Online朗文 5++Cos·sack /ˈkɒsæk $ ˈkɑːs-/ noun  a member of a people who lived on the plains of southern Russia and Ukraine, famous for their skill at fighting and at riding horses, and for their Russian dancing with the knees bent, the body low, and the arms folded in front of the body. —Cossack adjective Cossack horsemen

Cos·sack nounSyllable  

Cossack
Cos‧sack /ˈkɒsæk $ ˈkɑːs-/ noun
a member of a people who lived on the plains of southern Russia and Ukraine, famous for their skill at fighting and at riding horses, and for their Russian dancing with the knees bent, the body low, and the arms folded in front of the body.
—Cossack adjective:
    Cossack horsemen