This is somewhat related to the discussion of classical auxiliary verb ふ,
mentioned in the answer to snailboat's question, [What is the わ in 忌まわしい and
嘆かわしい?](https://japanese.stackexchange.com/questions/11678/what-is-
the-%E3%82%8F-in-%E5%BF%8C%E3%81%BE%E3%82%8F%E3%81%97%E3%81%84-and-%E5%98%86%E3%81%8B%E3%82%8F%E3%81%97%E3%81%84).

Another apparent iterative / repetitive ending that I've bumped into is る,
attaching not to the 未然形【みぜんけい】 but instead to the old 終止形【しゅうしけい】. This
suffix shows up much less often. Examples that come to mind are まく・まくる and
むく・むくる, but I think there may be a few more that escape me at the moment.
According to Shogakukan's _Kokugo Dai Jiten_ dictionary, this form appears to
have evolved from the classical 連体形【れんたいけい】, formed by adding る onto the
終止形【しゅうしけい】 for 二段{にだん} and 一段{いちだん} verbs (both 下{しも} and 上{かみ}). (I almost
listed あく・あくる above, but I realized that あくる here is still restricted to 連体-
only usage.)

Does anyone have any information on the process whereby this 連体形 form evolved
into an apparent iterative/repetitive? Alternatively, does anyone have any
explicit explanation of this formation and its semantic uses?
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2014-05-19T17:45:12.040
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2022-06-21T01:35:59.480
2017-04-13T12:43:48.447
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verbs etymology conjugations history morphology
Iterative / repetitive る evolving from classical 連体形【れんたいけい】