Vocabulary trainers often group their stuff by categories. Well, here's one of mine: word for rotten food and the effect it can have on us when we eat it :)
faulen, schimmeln, ranzig, sauer, schlecht, gammeln, kotzen, sich übergeben, ablaufen
The core idea of this root was:
The main English offspring is to shine and all its relatives. The only other family members I could find were shimmer and scintillate.
In German, it’s also the origin of Schimmel (the mold) because that is often white and shiny.