El PasoyoudaoicibaDictYouDict[El Paso 词源字典]
city in Texas, named for the nearby pass where the Rio Grande emerges from the Rockies, Spanish, short for el paso del norte "the northern pass;" see pass (n.1).[El Paso etymology, El Paso origin, 英语词源]
wetback (n.)youdaoicibaDictYouDict
"illegal Mexican immigrant to the U.S.," c. 1924, from wet (adj.) + back (n.); from notion of wading the Rio Grande.