After Jianzhen introduced religious precept to establish the kaicho (Certificates of Reception of Buddhist Commandments) system, the meaning of the term was limited to the certificate for the long-term trip for ascetic practices and so on.
鑑真が戒律を伝えて戒牒制度が整えられると、修行などによる長期旅行の証明の意味に限定されるようになった。