Believed to have been formed (with uncertainty, due to the unusual formation) as re- + pine, with the verb giving rise to the noun (first attested in 1529 and 1593 respectively); compare the Middle English verb repinen (“(uncertain) to cause trouble to someone, grieve”) (from pīnen (“to cause pain, grieve, hurt, trouble; to starve, pine; to torment, torture”), from Old English pīnian), which may be related.