Meaning:
Lit. “that’s where the dog lies buried” which seems to have been adopted from German and is present in multiple other, not only slavic or germanic languages. It’s used to point at the cause or the focal point of whatever is being discussed. Quite often one of people in a discussion jumps in with this expression as soon as he or she hears about whatever seems to be a key factor. It therefore also serves to stress one’s own opinion.
