The word “lox” hasn’t changed in sound or meaning in 8k years

“You collect words that mean more or less the same thing in all the languages, and if they look like each other in terms of their pronunciation, then it’s a good candidate for a descendant from a common ancestor.” “What is interesting about the word lox is that it simply happened to consist of sounds that didn’t undergo changes in English and several other daughter languages descended from Proto-Indo-European,” says Guy. The fact that those distantly related Indo-European languages had almost the same pronunciation of a single word meant that the word—and the concept behind it—had most likely existed in the Proto-Indo-European language.

Source: nautil.us