I recently noticed in passing that 湿気る is classified as both a godan and an
ichidan verb.  
For example, the past tense could be either:

しけった (godan)

or

しけた (ichidan).

This strikes me as being fairly unusual. Offhand, I can't think of any other
verbs that have this feature. Perhaps someone knows other verbs which are
classified as both godan and ichidan? Maybe someone even knows why...
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2018-10-27T14:32:46.013
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question
verbs godan-verbs ichidan-verbs
湿気る is both godan and ichidan. Are there other verbs like this?
I know this is not an optimal method, but I did a full text search on デジタル大辞泉
with `五段化`, and found the following examples of ichidan-to-godan change.

  * 湿気る: 下一段動詞「しけ（湿気）る」の五段化。
  * 下さる: 《動詞「くだされる」（下一）の五段化》
  * 抉る: 《「こじる」（上一）の五段化》
  * 遣わさる: ［動ラ五（四）］「つかわされる」（下一段）の五段化。

下さる and 抉る are always godan in modern Japanese. I didn't know 遣わさ(れ)る can
conjugate as a godan verb. I did a similar search on 明鏡国語辞典 and 湿気る was the
only verb with the remark "五段にも活用". So I think 湿気る is a rare example of verbs
that are both fully godan and fully ichidan in modern Japanese.

FWIW, I think I usually use the godan version of 湿気る. Most similar slangy
verbs made from an on-yomi noun usually conjugate as a godan verb (駄弁る, 事故る,
愚痴る, ...), so the ichidan version may become less popular in the far future.
[This question](https://japanese.stackexchange.com/q/52536/5010) may be
related.
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2018-10-28T02:22:55.317
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2018-10-28T02:22:55.317
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answer