Originally Slavic or Borrowing from Germanic?

[Karin Larsen]

Dear Seelangers,

There is some kind of rule or test that can be used to establish whether a 
word is (likely to be) originally Slavic or a borrowing from Germanic, but I can't 
remember what it is. I am pretty sure it has to do with an early sound change 
that took place before the borrowings, but which? Anyone's help will be 
greatly appreciated.

Best,

Karin 

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