Where does “stehenden Fußes” come from?

stehenden Fußes (German) comes from Latin stante pede, from Latin [[stante]] [[pede]].

stehenden Fußes (German): on the spot

Definitions

Step	Language	Word	Meaning
1	Latin	stante pede	with one’s foot standing still
2	Latin	[[stante]] [[pede]]	—

stehenden Fußes — Etymology, Origin & Word History | Etymology Explorer