62206
I saw this note on the [jisho.org page for
遊ぶ](https://jisho.org/word/%E9%81%8A%E3%81%B6):

> Other forms 遊ぶ 【あすぶ】
>
> Notes あすぶ: Out-dated or obsolete kana usage.

And I'm curious what this means - did it used to be read this way? Or do some
people still read it this way? What happened?
CC BY-SA 4.0
2018-10-15T07:52:11.147
62205
2018-10-15T11:45:47.257
31590
question
readings history
Why is あすぶ an "out-dated or obsolete" kana usage for 遊ぶ?
According to many dictionaries, あすぶ is just a phonetic shift (音変化) of あそぶ.
([source](https://kotobank.jp/word/%E9%81%8A%E3%81%B6-424899)) From this
description, it seems like あそぶ is the original spelling, and あすぶ is the
derivative... so it doesn't seem like あすぶ is an old form of the word.

あすぶ is also listed in some dictionaries as part of regional dialects. For
example, it's listed as ibaraki-ben (in 茨城弁大辞典), the agatsuma dialect (in
あがつま語), and koushuu-ben (in 甲州弁辞典).
([source](https://www.weblio.jp/content/%E3%81%82%E3%81%99%E3%81%B6#top))

In [this hinative thread](https://hinative.com/ja/questions/3890622), a native
speaker says that they never heard of あすぶ. All things considered, it seems
like this pronunciation should be avoided for general-purpose conversation.
CC BY-SA 4.0
2018-10-15T11:45:47.257
62206
2018-10-15T11:45:47.257
25859
62205
answer