Where does “slaht” come from?

slaht (Old High German) comes from Proto-Germanic slahtiz, from Proto-Indo-European slek- — to beat, pound.

Ancestry of “slaht”, step by step

Step	Language	Word	Meaning
1	Proto-Germanic	slahtiz	beating, hitting, killing, murder
2	Proto-Indo-European	slek-	to beat, pound

slaht — Etymology, Origin & Word History | Etymology Explorer