ākṣṇu
Monier-Williams Sanskrit-English Dictionary (1st ed.)
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p. 112, col. 3.
ākṣṇu ā-kṣṇu, cl. 2. P.
-kṣṇauti, -kṣṇa- vitum, to rub, polish up; sharpen.
Monier-Williams Sanskrit-English Dictionary (2nd ed.)
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p. 128, col. 3.
ā-√ kṣṇu -kṣṇauti, to rub up, polish up,
KātyŚr.