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I find some (young?) people say ちげー when they mean 違う. Is there other verb
that is frequently sound-reduced? (BTW, what is the correct way to describe
this phonological phenomenon or the word for this kind of phonological
change?)
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2020-08-27T04:53:55.313
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2020-08-27T06:46:40.650
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question
slang contractions phonology
Sound change of verbs (違う → ちげー)
I think this is a variant of the **/ai/-to-/ee/ sound change** that typically
happens with i-adjectives:

  * [What does こまけー mean?](https://japanese.stackexchange.com/q/3746/5010)
  * [What is じゃねぇか? What is its original form?](https://japanese.stackexchange.com/q/18454/5010)
  * [わからない vs わかね in My Boss My Hero](https://japanese.stackexchange.com/q/13069/5010)

If I understand correctly, in the past, ちげぇ (also written as ちげー or ちげえ)
happened only when ちがう conjugated to the continuative form, ちがい (chig **ai**
). For example, speakers of [Tokyo Shitamachi
dialect](https://en.wikipedia.org/wiki/Tokyo_dialect) have long said ちげぇます
instead of ちがいます, or ちげぇねぇ instead of ちがいない. Likewise, it has been always
possible to contract 笑います to われぇます, 歌いたい to うてぇてぇ, and so on.

However, this still does not explain why ちがう (chig **au** ) followed by
nothing became ちげぇ. Some young people do say ちげぇ instead of ちがう today,
although no one says うてぇ instead of うたう.

I think this phenomenon is unique to 違う, and is related to the recent peculiar
(mis)use of 違う. In today's nonstandard slang, 違う occasionally conjugates like
an adjective, as if there were an i-adjective 違い. Have you ever seen 違くない, 違くて
or 違かった used by young speakers? These are definitely nonstandard, but for
those who feel they are natural, saying ちげぇ instead of ちがう should be natural,
too, because their brains recognize the word ちがい as an adjective. (Of course
they are not consciously aware of this.)

References:

  * [「○○とは違って」というのを「違くて」とか「違うくて」という人がいますが，なぜですか](https://kotobaken.jp/qa/yokuaru/qa-33/)

>
> 首都圏などで聞かれる「ちげーよ」という言い方から，既に形容詞の終止形「ちがい」が成立しているとする考え方もあります。「ちげー」は「ちがう」からの変化形とは考えにくく「ちがい」からの変化だろうというわけです。

  * [認め難い「違くて」「違かった」](https://mainichi-kotoba.jp/blog-20200502#:%7E:text=%E3%81%A1%E3%81%8C%E3%81%8B%E3%81%A3%E3%81%9F%E3%80%90%E9%81%95%E3%81%8B%E3%81%A3,%E9%81%95%E3%81%A3%E3%81%9F%E3%80%82)
  * [五段活用動詞 ｢違う｣ の形容詞型活用](https://opac.ll.chiba-u.jp/da/curator/900067278/nihonbunka12_ishii.pdf)
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answer