Definition of alguacil in English:
 alguacil
nounPlural alguaciles ˌalɣwaˈθilˌalɡwaˈθiːlˌalɣwaˈsil
Each of a pair of mounted constables acting as an official at a bullfight.
 Example sentencesExamples
-  While the purpose of this measure was to eliminate the alguaciles, it proved impossible to do so, and they continued to exist alongside the marine guards.
 -  It stated that if a commissioner disappeared the alguacil would he held responsible.
 -  The Spanish Constitution of 1812 and the subsequent independence of Mexico, which transformed many colonial institutions, did not substantively alter the alguacil's position.
 -  From this body the petty local officials were chosen; namely, the Gobernadorcillo, or ‘Petty Governor,’ and his lieutenants, the alguaciles, or constables, and other minor officers.
 -  My policemen are the wolves, my alguaciles [runners] are the coyotes.
 
Origin
  
Spanish, from Arabic al-wazīr 'the helper, aide, or vizier'.