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What is the meaning of 腹んばい and 腹んばいになって？

Also, is it read 「はらんばい」？

I understand that 腹んばい悪い seems to mean 'get mad' (腹が立つ), but this other usage
seems like it isn't about anger.

Here is the context from Akutagawa's Nyotai:

> 楊某 {ようぼう} と云う支那人が、ある夏の夜、あまり蒸暑いのに眼がさめて、頬杖をつきながら腹んばいになって、とりとめのない妄想 {もうぞう}
> に耽っていると、ふと一匹の 虱 {しらみ} が寝床の 縁{ふち} を這っているのに気がついた。

From googling, this word still seems to be in use. I can't find this word in
my kokugo dictionaries, which includes daijisen and genius (mac
dictionary/goo). Why is that?
CC BY-SA 3.0
2012-01-26T06:25:47.023
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2015-11-12T21:07:50.617
2015-11-12T11:24:07.557
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question
etymology pronunciation readings phrases rendaku
what is the meaning of 腹んばいになって?
[腹ん這い]{はらんばい}になって is an 音変化{おんへんか} (shift in sound) of
[[腹這い]{はらばい}になって](http://eow.alc.co.jp/search?q=%E8%85%B9%E3%81%B0%E3%81%84%E3%81%AB%E3%81%AA%E3%81%A3%E3%81%A6)
"flat on one's belly".

In a similar way,
[[四つん這い]{よつんばい}](https://kotobank.jp/word/%E5%9B%9B%E3%81%A4%E3%82%93%E9%80%99%E3%81%84-654615)
is an 音変化 of
[[四つ這い]{よつばい}](https://kotobank.jp/word/%E5%9B%9B%E3%81%A4%E9%80%99%E3%81%84-654578)
for example.

See also [腹這い](https://kotobank.jp/word/%E8%85%B9%E9%80%99%E3%81%84-605066).
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2012-01-26T06:47:58.207
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2015-11-12T21:07:50.617
2015-11-12T21:07:50.617
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answer