Where does “λαγωός” come from?

λαγωός (Ancient Greek) comes from Proto-Indo-European (s)leg — to droop, be slack, languid.

Ancestry of “λαγωός”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	(s)leg	to droop, be slack, languid

λαγωός — Etymology, Origin & Word History | Etymology Explorer