Sentence:  Though George had stopped in his sentence, yet, his blood being up, he was not to be cowed by all the generations of Osborne; rallying instantly, he replied to the bullying look of his father, with another so indicative of resolution and defiance, that the elder man <WSD>quailed</WSD> in his turn, and looked away. 
Meaning of the word marked with <WSD> tags:  To lose heart or courage; to be daunted or fearful. (from 16th c.)