2996: T in English is S in German Mar 6, 2025

It is very common that Southern and Eastern German dialects (hence Standard German) cognates of Dutch and English words will end in [s] while their counterparts end in [t], such as

(German - Dutch - English:)

Was - Wat - What

Straße/Gaße - Straat - Street/Gate

Das - Dat - That

This is not a new phenomenon in German either. The German state of Hessen is named after a local Germanic people at the time of the Romans, when there were the Chattii and Chatuari. The name was already attested as Hesso in Old High German, and various other related forms [Chassi, Hassi]. 

This shift did not happen with Northern and Western Germanic dialects like Dutch but also the Kölsch dialect, where the name of the German state was borrowed with the [s] but elsewhere not.