摂政

/sepuɕʲau/ → /seɸuɕʲau/ → /seuɕʲau/ → /ɕʲɔːɕʲɔː/ → /ɕʲoːɕʲoː/

From Middle Chinese compound 攝政／摄政 (syep tsyeng^H, literally “grasp + government”). Compare modern Mandarin 攝政／摄政 (shèzhèng, “to act as a regent”).

The goon, so likely the reading as first borrowed.

• IPA^(key): [ɕo̞ːɕo̞ː]

摂(しょう)政(しょう) • (shōshō) ^{←せふしやう (sefusyau)?}

1. (archaic) the chief advisor to the emperor, similar to a viceroy or vizier

• (viceroy): 関白(かんぱく) (kanpaku)

Japanese Wikipedia has an article on:

摂政

Wikipedia ^ja

English Wikipedia has an article on:

Regency

Wikipedia

Shift in reading of shōshō above, using the kan'yōyomi of setsu for the 摂 character.

• (Tokyo) せっしょー [séꜜsshòò] (Atamadaka – [1])^[1]
• (Tokyo) せっしょー [sèsshóó] (Heiban – [0])^[1]
• IPA^(key): [se̞ɕːo̞ː]

摂(せっ)政(しょう) • (sesshō) ^{←せつしやう (setusyau)?}

1. a regent: one who rules in the place of a monarch because the monarch is too young, absent, or disabled
2. regency: the position or station of a regent
3. (archaic) the chief advisor to the emperor, similar to a viceroy or vizier

• (viceroy): 関白(かんぱく) (kanpaku)

• 摂政(せっしょう)皇太子(こうたいし) (sesshō kōtaishi): the Prince Regent

• Shōgaku Tosho (1988) 国語大辞典（新装版） [Unabridged Dictionary of Japanese (Revised Edition)] (in Japanese), Tōkyō: Shogakukan, →ISBN