Correct spelling for the English word "sweatt" is [swˈɛt], [swˈɛt], [s_w_ˈɛ_t] (IPA phonetic alphabet).
The word "sweatt" is a variant spelling of the word "sweat", which originated in Old English as "swætan". It ultimately derives from the Proto-Germanic word "*swaitaną". The word has been in use since ancient times, and its exact origins beyond Proto-Germanic are uncertain. However, it is believed to be related to other Germanic languages, such as Old High German "sweiz" and Old Norse "sveiti". The word "sweatt" is simply an alternative spelling of "sweat" and does not significantly alter the etymology.