(n) the act of calling down a curse that invokes evil (and usually serves as an insult), Syn. malediction, Example:he suffered the imprecations of the mob
n. [ L. imprecatio: cf. F. imprécation. ] The act of imprecating, or invoking evil upon any one; a prayer that a curse or calamity may fall on any one; a curse. [ 1913 Webster ]
Men cowered like slaves before such horrid imprecations. Motley.