Honchi-suijaku is one of the thoughts of Shinbutsu-shugo (the amalgamation of Buddhism with Shinto) that emerged during the era in which Buddhism flourished in Japan; it supports the view that yao yorozu no kami (eight million gods) are Gongens, the embodiment of various types of Buddhas (including Bosatsu (Bodhisattva) and Tenbu (Deva)), which appeared in the land that was Japan.
本地垂迹（ほんちすいじゃく）とは、仏教が興隆した時代に表れた神仏習合思想の一つで、日本の八百万の神は、実は様々な仏（菩薩や天部なども含む）が化身として日本の地に現れた権現（ごんげん）であるとする考えである。