Jisho

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Auxiliary verb
1. indicates recollection or realization (i.e. of hearsay or the past); can form a poetic past tense​Archaic
Auxiliary verb
2. indicates continuation from the past to the present​Archaic
Noun
3. end; conclusion​See also けりが付く, See also けりを付ける, from the use of the aux. at the end of waka, also written with the ateji 鳧

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