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Can someone add shevuot on to existing shevuot? Can he “pile on” additional prohibitions to ones that exist already?
The Gemara on our daf introduces us to two concepts that may allow him to do just that: issur kollel and issur mosif.
Issur kollel means an inclusive prohibition. In a case of issur kollel we do not find an extra prohibition added, rather the new issur expands the context of the already existing prohibition so that this activity is now included under a different category at the same time that it retains its original prohibition.
An example of this is a nevela – non-kosher meat that is forbidden in-and-of itself – that is eaten on Yom Kippur. Since Yom Kippur creates a situation wherein all food is prohibited, the nevela will gain a second prohibition in addition to its basic prohibition.
Issur mosif means an additional, or expanded, prohibition. There are some cases where the issur does not fall under a larger category that adds a prohibition to it, rather there is an actual addition made to it that did not exist beforehand.