所為

所為

1. what one does; behaviour; actions

所為

1. cause; reason

From Middle Chinese 所為 (MC srjoX hjwe|hjweH). The goon, so likely the initial borrowing.

• (Tokyo) しょい (Atamadaka – )^[1]
• IPA^(key):

所(しょ)為(い) • (shoi) ^{←しよゐ (syowi)?}

1. one's deed
2. cause, reason

*/sjowi/ → */sjoi/ → /ɕoi/ → /ɕei/ → /sei/ → /seː/

Probably a shift from shoi above.^[2]

• (Tokyo) せー (Atamadaka – )^[1]
• IPA^(key):

所(せ)為(い) • (sei) ^{←せゐ (sewi)?}

1. cause, reason, fault

   あいつのせいで全(ぜん)部(ぶ)台(だい)無(な)しになった。

   Aitsu no sei de zenbu dainashi ni natta.

   It all came to nothing because of that fool.

This term is usually used for negative incidents.

This sei reading is usually written in kana.

From Middle Chinese 所為 (MC srjoX hjwe|hjweH). The kan'on, so likely a later borrowing. Compare modern Min Nan reading só͘-ûi, Hakka só-vì.

• (Tokyo) そい (Atamadaka – )^[1]
• IPA^(key):

所(そ)為(い) • (soi) ^{←そゐ (sowi)?}

1. one's deed