A primitive root; to point (transitive or intransitive); intensively, to pierce; figuratively, to inculcate -- prick, sharp(-en), teach diligently, whet.
H8150. shanan
[שָׁנַן] verb whet, sharpen (compare Arabic id.; Aramaic שְׁנִינָא, sharp, etc.; Ethiopic [] III, 2, contend, litigate; hence שֵׁן tooth, Late Hebrew id., Assyrian šinnu, Arabic , Ethiopic Aramaic שִׁנָּא, ); —
Qal whet, sharpen: Perfect1singular חַרְבִּי בְּרַק שַׁנּוֺתִ֫י אִם (Ges§ 67ee) Deuteronomy 32:41, of ׳יs preparation for judgment; 3 plural (כַחֶרֶב) לְשׁוֺנָם שָֽׁנְנוּ Psalm 64:4; 140:4 of uttering sharp words; Passive participle שְׁנוּנִים sharpened, of arrows, Isaiah 5:28; Psalm 45:6, figurative of tongue 120:4, of false witness Proverbs 25:18.
Pi`el Perfect consecutive לְבָנֶיךָ וְשִׁנַּנְתָּם Deuteronomy 6:7 i.e. teach the words incisively, German 'einschärfen.'
Hithpo`el Imperfect1singular Psalm 73:21 in my kidneys אֶשְׁתּוֺנָ֑ן I was pierced (of poignant envy).