Noun
encierro (plural encierros)
(bullfighting) A bull run, usually one held in Spain.
Synonyms: bull run, running of the bulls
A bylaw regulating the encierro is dated 1283: cows, oxen and bulls are released each year in the streets of Petit Bayonne during the summer festivals. Source: Internet
Bull runs and bullock games The encierro (bull run) in Pamplona 's fiestas Sanfermines started as a transport of bulls to the ring. Source: Internet