Definition of forspeak
1 now dialectal British : to cast a bad spell over : bewitch especially by immoderate praise don't boast about the child, lest you forspeak him
2 obsolete : to speak against : asperse
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Origin and Etymology of forspeak
Middle English forspeken to cast a bad spell over, speak evil of, from Old English forspecan, forsprecan to speak in vain, deny, denounce, from for- + specan, sprecan to speak — more at speak
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