migra n. the border patrol at the shared U.S. boundary with Mexico. Editorial Note: Used by Spanish-speaking undocumented immigrants as la migra. The border patrol, originally part of the United States Immigration and Naturalization Service, is now a part of the U.S. Customs and Border Protection within the Department of Homeland Security. Etymological Note: Clipped form of Sp. migración ‘migration.’ (source: Double-Tongued Dictionary)