This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 殬 is uncertain. It combines 歹 (death/damage) with 睪, but the original semantic and phonetic roles are unclear.
With 歹 (death/damage) on the left and a complex right side, 殬 suggests something broken or ruined, but its exact meaning is obscure.
For ト, imagine a broken toe (ト) that has been damaged: toe -> ト, and the damage fits the 歹 component.