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Which of these words are cognates (share a common etymology)?

  * 住【す】む ("live") (rarely 棲む or 栖む)
  * 澄【す】む ("clear") (rarely 清む)
  * 済【す】む ("end")

According [gogen allguide](http://gogen-allguide.com/su/sumimasen.html) and
several dictionaries such as the
[大辞泉【だいじせん】](http://dictionary.goo.ne.jp/smp/leaf/jn2/120156/m0u/), `済む`
derives from `澄む`. Perhaps the English expression `I believe that the issue is
#cleared up#.` helps to illustrate this relationship.

The 広辞苑【こうじえん】 dictionary (6th ed.) speculates that `住む` derives from `巣【す】`
("nest"), and lists `巣にいる` as the first (ie oldest) meaning. It also quotes
the following phrase from the 古今和歌集【こきんわかしゅう】 providing a certain plausibility
for the suggested etymology: `花【はな】に鳴【な】く鶯【うぐひす】、水【みづ】に住【す】むかはづの声【こゑ】を聞【き】けば`.
Although, it is not quite clear to me why `住む` here would mean `巣にいる`
specifically and not `to live` in general.

This suggest that 住む is unrelated to 澄む・済む. However, I did not find any
information regarding the origin of 澄む.

Are the above mentioned sources correct? Is 澄む cognate with 住む, or are they
not related at all?
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2014-10-27T20:01:39.783
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2014-10-30T18:17:38.973
2014-10-27T20:22:35.823
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question
etymology false-etymology
Are 済む・澄む・住む cognate?
Much as described in the question comments by Yang Muye and blutorange, 1) all
of these _sumu_ verbs derive from Old Japanese in ways that make the kanji
irrelevant to a discussion of etymology, and 2) all of the modern senses of
_sumu_ arise from an underlying idea of **to settle**. Interestingly, the
English term **to settle** covers most of the same meanings as the Japanese
_sumu_ : to **live in a place** , to **become clear** (such as water), to
**finish** , to **be fully paid** (such as an account), etc.

(This same etymology was briefly mentioned [in this other
post](https://japanese.stackexchange.com/questions/17344/difference-between-
the-words-for-living-
residing-%E4%BD%8F%E3%82%80-%E6%A3%B2%E3%82%80-%E6%B3%8A%E3%81%BE%E3%82%8B-%E6%9A%AE%E3%82%89%E3%81%99#answer-17350).)
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2014-10-30T18:17:38.973
2017-04-13T12:43:44.740
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answer