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This has really confused me for a long time. Considering the fact that the
Classical Japanese form of the verb 閉じる is 閉づ, the expected reflex of 閉ざす
should be *閉だす; 閉じる is actually etymologically 閉ぢる and the spelling with じ is
just a consequence of the 四つ仮名 & 現代仮名遣い. However, it is not - the modern form
閉ざす suggests a classical form 閉ず, which would make no sense as there wasn't
even a ザ行上二段活用 verb class (there was a shimo nidan one though). This is
obviously a huge contradiction. And this obviously can't be just an
exceptional quirk of the ダ行 if it weren't also for the existence of
[怖]{お}じる/[脅]{おど}す, coming from [怖]{お}づ, of the same kami nidan class as 閉づ.

So my question is, what is the deal with this inconsistency? Why 閉ざす and not
*閉だす?

My only possible guess for this is that 閉ざす is actually not derived from the
same root as 閉づ at all but a compound [戸]{と}[鎖]{ざ}す, and it was just
confused/conflated/reanalyzed as being related to 閉じる later on when the ぢ-じ
distinction disappeared. But that seems kind of problematic, because 閉じる was
still written as 閉ぢる up until 1946 or later, and popularized/standardized
kanji spellings have generally been coined way back in time before that,
probably even before the 四つ仮名 mergers became widespread in the Edo period.
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question
verbs etymology classical-japanese false-etymology
Why is 閉ざす the "-す form" of 閉じる when the classical form was kami nidan 閉づ?
This is a good example of how kanji spellings can obscure word derivations.

閉【と】ざす, despite the kanji, is etymologically unrelated to 閉【と】じる.

### 閉【と】じる

This first appears in a text from 810, and was conjugated as a
上二段活用動詞【かみにだんかつようどうし】 or "upper-bigrade conjugation verb". These are the
precursors to your modern "vowel-stem verbs" where the stem (the part that
stays the same across all conjugations) ends in //i//. The original
終止形【しゅうしけい】 ("terminal form", a.k.a. sentence-ending form, predicative form,
plain form, dictionary form) was とづ.

The verb is one of the rare [ambitransitive
verbs](https://en.wikipedia.org/wiki/Ambitransitive_verb) in Japanese, meaning
it can be used as both transitive and intransitive. It looks like the
transitive senses are attested first (in 810), followed later by the
intransitive senses starting in _The Tale of Genji_ in about 1000.

The core meaning has been "to close".

### 閉【と】ざす

This first appears in roughly 900, conjugated as a 四段活用動詞【よだんかつようどうし】 or
"quadrigrade conjugation verb". These are the precursors to your modern
"consonant-stem verbs" where the stem (the part that stays the same across all
conjugations) ends in a consonant -- in this case, //s//.

This verb is also attested as
[ambitransitive](https://en.wikipedia.org/wiki/Ambitransitive_verb), with the
intransitive senses appearing from around 900, and the transitive much later,
from around 1885. The intransitive senses appear to have become obsolete,
likely due to the ～す ending giving an impression that this verb should be
transitive.

The core meaning has been "to close and lock".

This aligns with the compound meaning indicated by many dictionaries I've
consulted -- とざす from 戸【と】 ("door") + 鎖【さ】す ("to close", with overtones of "to
lock", from the base _sasu_ sense of "to pierce with something long and
skinny", presumably in reference to either the bolt or key of a lock).

### Speculation

Considering the compound nature of とざす, it is reasonable to wonder if とじる is
also a compound. Given older spelling とぢる and original base form とづ, this
looks like it might be from 戸【と】 ("door") + 出【づ】 ("to come out"), perhaps from
the way that doors in Asian architecture are often pocket doors that slide out
from the wall.

However, 出【づ】 consistently conjugates as a 下二段活用動詞【しもにだんかつようどうし】 or "lower-
bigrade conjugation verb" with conjugation stems ending in //e//. I cannot
find any evidence of this ever appearing as an upper-bigrade verb instead, so
this looks like a long-shot theory at best.

#### Sources

I often refer to the 日本国語大辞典【にほんこくごだいじてん】 or NKD. This dictionary often
includes more historical information about words than most other dictionaries
that I've used. One version of the NKD is made available for free by online
reference aggregator Kotobank.

  * [閉【と】じる entry](https://kotobank.jp/word/%E9%96%89-623769)
  * [閉【と】ざす entry](https://kotobank.jp/word/%E9%8E%96%E3%83%BB%E9%96%89-2067363)
  * [鎖【さ】す entry](https://kotobank.jp/word/%E5%88%BA%E3%83%BB%E8%9E%AB%E3%83%BB%E6%8C%BF%E3%83%BB%E6%B3%A8%E3%83%BB%E7%82%B9%E3%83%BB%E9%8E%96-2042870)
  * [出【で】る entry](https://kotobank.jp/word/%E5%87%BA-528830)
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answer