talmud gemara - Issur Kolel What is it?

What is Issur Kolel in the context of "AIN ISSUR CHAL AL ISSUR" I heard two people talking about the concept please illustrarte with example and explain the illustration of the example?

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Edit by YDK:

Example: A diseased animal (treifah) is forbidden to eat, even if properly slaughtered. If the slaughter is done improperly (nevela), this would normally create a 2nd issur when eaten. The rule of ain issur chal al issur would block the 2nd issur from setting since a previous issur exists with similar characteristics.

This block does not exist when the 2nd issur is "more forbidden" than the first. If the 2nd issur would be a mixture between the treifah and milk, the milk & meat issur would take effect since the 2nd issur also forbids benefit, whereas treifah did not (Issur mosif).

Answer

In general, once something is prohibited, it cannot become prohibited again; that is, no one thing cannot be prohibited for two reasons, rather the first prohibition governs. In practice, this means, inter alia, that a transgressor is only punished for violating the first prohibition, not the second.

There are a few exceptions to this basic rule, two of which are Issur Kolel and Issur Mosef.

Issur Kolel means that the second prohibition includes other things which are not yet prohibited. For example, when Yom Kippur begins, all food in the world becomes prohibited. Therefore, food that was already prohibited before Yom Kippur, such as pork, become prohibited again, along with all kosher food.

Issur Mosef means that the second prohibition includes more people than the first one did. For example, you are prohibited from marrying your sister. When she gets married to someone, she becomes prohibited to you again, along with everyone else to whom she was previously permitted.