Sentence:  One is said to <WSD>"forspeak</WSD>" another, when he so commends him as to have a supposed influence in making him practically belie the commendation. If one highly praises a child for sweetness of temper, and the child soon after betrays ill humour; the person, who bestowed the praise, is said to have "forspokin the bairn". 
Meaning of the word marked with <WSD> tags:  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.