I recently came across this sentence:
I thought at first that しきり might be しきる, as in "do to completion", but then it would make more sense as 「しきったが」rather than 「しきりだが」. I also saw on a Chiebukuro post that as 頻り, 「後悔しきり」means to "regret one thing after another". The main character of the story does make this expression quite often at ホロ. However, I am still unsure what しきり means here.
What does this しきり mean?