This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
奯 combines 大 (big) with 歲 (year), but the exact historical development and original meaning are uncertain.
The top 大 suggests something large, and the bottom 歲 suggests a long span of time. Imagine something so vast it spans years, but its exact meaning is unclear.
For カツ, imagine a vast, empty space that cuts off all sound: cut -> カツ, and the big empty years stretch on.