What's the "een" in Halloween?
late 13c., "to follow with hostile intent," from Anglo-French pursuer and directly from Old French poursuir (Modern French poursuivre), variant of porsivre "to chase, pursue, follow; continue, carry on," from Vulgar Latin *prosequare, from Latin prosequi "follow, accompany, attend; follow after, escort; follow up, pursue," from pro- "forward" (see pro-) + sequi "follow" (see sequel). Meaning "to proceed, to follow" (a path, etc.), usually figurative (a course of action, etc.), is from late 14c. This sense also was in Latin. Related: Pursued; pursuing. For sense, cf. prosecute.