Real Dictionary

bola in American English
a set of cords or thongs with heavy balls at the ends, for throwing at cattle and entangling their legs
noun: a weapon consisting of two or more heavy balls secured to the ends of one or more strong cords, hurled by the indigenous people and gauchos of southern South America to entangle the legs of cattle and other animals

bola in British English
noun: a missile used by gauchos and indigenous people of South America, consisting of two or more heavy balls on a cord. It is hurled at a running quarry, such as an ox or rhea, so as to entangle its legs