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What is the etymology of verbs like [安]{やす}らぐ, [和]{やわ}らぐ, [薄]{うす}らぐ,
[平]{たひ}らぐ, etc.? I know they all come from adjectives, but where does the 〜ぐ
come from?

Maybe [揺]{ゆ}らぐ could also fit into this question, but I read it comes from the
verb [揺]{ゆ}る and it was initially [揺]{ゆ}らく that softened into [揺]{ゆ}らぐ, so it
might be different.
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question
verbs etymology adjectives
What is the etymology of ~らぐ verbs?
I found several people who think らぐ is some kind of suffix, but looks like
this is not explicitly listed in dictionaries as a standalone suffix. If らぐ is
a suffix, it should be similar in purpose to English
[_-ate_](https://en.wiktionary.org/wiki/-ate#Suffix) used to turn words into
verbs (e.g., _formulate_ , _activate_ ).

  * <https://kogani.com/text/japanese/arekore_11.html>

> 動詞には接尾辞を伴った(ように思える)言葉があります。例としては"なう"、"しむ"、"らぐ"、"めく"などがあります。  
>  やすらぐ(安らぐ)、やわらぐ(和らぐ)、たいらぐ(平らぐ)、ゆらぐ(揺らぐ)、うすらぐ(薄らぐ)など

  * <https://hoshinahouse.blog.fc2.com/blog-entry-1226.html>

> 「はららぐ」
>

>>
それから二十何年後か後の初夏、まったく人気のない浅間山の中腹を登っていた。道がくのｊ字に折れる所へきて、折れてびっくり、声をあげた。狭い道の両側から卯の花と茨の花が、たわわに咲き重なって真っ白く、あたり一面が濃く匂って、森閑と静寂、とき折りひとりでに花は
**はららいで** こぼれ落ちていた。（「川と山のにおい」P16）

>
> 「はらはら」の「はら」に接尾語「らぐ」が付いたもの。「安らぐ」「薄らぐ」「和らぐ」など、「らぐ」の付く語はあるけれども、擬態語に付くのは珍しい気がする。

You may be interested in [this research
paper](https://core.ac.uk/download/pdf/41885984.pdf) (PDF, in Japanese) which
attempted to categorize "suffix-like" verb endings (e.g., まる as in 高まる, 固まる,
太まる; める as in 丸める, 細める, 緩める).
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