Krausening

Some beers claim to be "fully krausened." What does this mean? Krausening involves adding a portion of actively fermenting wort (unfermented beer) to a batch of beer that has already finished fermenting.

Krausening can help to improve the beer's flavor profile by reducing certain off-flavors and contributing to a cleaner, more refined taste. So if a beer is "fully krausened" it simply means this brewing technique has been used..

Here is a deeper dive on the subject.