Sentence:  The Pupil after his Pupillarity, had granted a Diſcharge to one of the Co-tutors, which did <WSD>extinguiſh</WSD> the whole Debt of that Co-tutor, and conſequently of all the reſt, they being all "correi debendi", lyable by one individual Obligation, which cannot be Diſcharged as to one, and ſtand as to all the reſt. 
Meaning of the word marked with <WSD> tags:  to destroy or abolish something