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And “Knacker” is also a sausage because it “knacks” when you break it in half. Knack in German has the meaning snap or crack.

I’m glad you added the origin - sausages made from old or diseased animals don’t sound great.

"sausages made from old or diseased animals don’t sound great."

But that's what they were made of originally - and still are in areas with bad overwatch.