Where does “birihten” come from?

birihten (Middle High German) comes from Old High German birihten — to straighten out, make tidy; to make correct.

Ancestry of “birihten”, step by step

Step	Language	Word	Meaning
1	Old High German	birihten	to straighten out, make tidy; to make correct

birihten — Etymology, Origin & Word History | Etymology Explorer