ystan (Old English) comes from Old English yst, from Proto-West Germanic unsti, from Proto-Germanic undiz, from Proto-Germanic unnaną, from Proto-Indo-European ān- — to notice; face, mouth.
ystan (Old English): to storm, be stormy, rage
Definitions
to storm, be stormy, rage
Ancestry of “ystan”, step by step
ystan traces back through two separate lines of ancestry.