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Sometimes I'm having trouble choosing the reading for 入る. There was a [related
question](https://japanese.stackexchange.com/a/6878) about the reading of 入れる,
however my JMdict-based dictionary marks both 入る{はいる} and 入る{いる} as
intransitive verbs (自動詞) - is it correct? If so, then how to choose among
them? My particular sentence in question this time is

> ためしに、ドアと窓をはずしてみたら、風がどどっと入{?}ってきて、一瞬で空気が入{い}れかわった

The second reading is certain (from 入{い}れ替{か}わる), but I'm not sure about the
first one: the dictionary has " _to enter/to go into/to break into_ " among
the meanings for 入る{はいる}, and " _to come in/to flow into_ " for 入る{いる}, and
both seem to fit here.

And BTW, is どどっと an onomatopoeic word? Failed to find anything close in the
dictionary.
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2016-07-23T13:43:16.573
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question
readings
Reading of 入る - 「はいる」 vs 「いる」
[入]{はい}る = intransitive verb  
[入]{い}れる = transitive verb

ex:  
箱に[入]{はい}る  
箱に[入]{い}れる

ex:  
風が[入]{はい}る  
空気を[入]{い}れる

I hope it helps you.^^
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2016-07-24T19:14:04.197
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answer
Basically, in contemporary Japanese, intransitive 入る = /hairu/. The /iru/
readings are essentially all survivals from an earlier stage in which 入る was
just /iru/. (In fact, /hairu/ is basically /hau/ "crawl" + /iru/, which is why
sometimes in older texts you see it written 這入る).

So your best bet is to assume that 入る is /hairu/ on its own and /ir-/ in
compound words (入り口 = /iriguchi/, 入れ替わる = /irekawaru/), and learn the
exceptions one by one. There are quite a few such exceptions in the
dictionary, but you won't actually encounter one very often. Most of them have
a fairly old-fashioned or literary feel and are pretty rare nowadays. The big
exception to this is 気に入る /ki ni iru/ but it seems you have that one down
already.

(If it makes you feel any better, misreading the 入る in expressions like 神に入る
as /hairu/ is relatively common even among native Japanese speakers, precisely
because /iru/ _is_ an exceptional reading these days.)

So: どどっと入る is almost certainly /dodotto hairu/, because it's not a set phrase,
and so there's no reason for 入る to have anything other than its standard
reading. And どどっと is probably mimetic, yeah, don't know about onomatopoeic.
Try looking up どっと -- it's basically a reduplicated form of that.
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2016-07-25T00:55:19.690
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answer