Definition of forspeak:
(v) :
(transitive, dialectal, Northern England and Scotland) To injure or cause bad luck through immoderate praise or flattery; to affect with the curse of an evil tongue, which brings ill luck upon all objects of its praise.
(v) :
(transitive, obsolete) To say bad things about; to slander.
(v) :
(transitive, obsolete) To forbid, to prohibit; to oppose.
(v) :
(transitive, obsolete) To bewitch, to charm.
(v) :
(transitive, obsolete) Alternative spelling of forespeak. [(transitive, archaic) To foretell, to predict.]