Sentence:  You were talking of <WSD>tampering</WSD>, just now. Who <WSD>tampered</WSD> with Yorkshire schoolmasters, and, while they sent the drudge out, that he shouldn't overhear, forgot that such great caution might render him suspicious, and that he might watch his master out at nights, and might set other eyes to watch the schoolmaster? Who <WSD>tampered</WSD> with a selfish father, urging him to sell his daughter to old Arthur Gride ... 
Meaning of the word marked with <WSD> tags:  To try to influence someone, usually in an illegal or devious way; to try to deal ("with" someone).