means The sustained, hostile mistreatment of a person or group, often for their beliefs, identity, or origins.

from From Latin 'persequi,' meaning 'to follow through, pursue, chase down' — built from 'per-' (through, thoroughly) and 'sequi' (to follow), a cousin of words like 'sequence' and 'pursue.' The image is brutally literal: not just disliking someone but hunting them, dogging their steps without letting up. It entered English through Old French 'persecucion' in the medieval period, already carrying the heavy sense of relentless pursuit aimed at the faithful and the dissenting.