שָׁנַן shânan (H8150)

to point (transitive or intransitive); intensively, to pierce; figuratively, to inculcate

1) to sharpen, whet 1a) (Qal) to whet, sharpen 1b) (Piel) to sharpen, teach (incisively) 1c)(Hithpolel) to be pierced

a primitive root;