Where does “-zio” come from?

-zio (Old High German) comes from Proto-Germanic -itją, from Proto-Germanic -itjaną, from Proto-Indo-European -dyé-.

Ancestry of “-zio”, step by step

StepLanguageWordMeaning
1Proto-Germanic-itjąSuffix denoting the action of verbs ending in...
2Proto-Germanic-itjanąCreates intensive verbs
3Proto-Indo-European-dyé-—
Every word from Proto-Indo-European -dyé- →Every word from Proto-Germanic -itjaną →Every word from Proto-Germanic -itją →