'Sharp' is PIE *sker- (to cut) — the same root produced 'shear,' 'share,' 'short,' 'shirt,' and 'skirt.'
Having an edge or point that is able to cut or pierce; keen or acute in intellect or perception; sudden and marked; (in music) above the correct or normal pitch.
From Old English 'scearp' (sharp, cutting, pointed), from Proto-Germanic *skarpaz (sharp, cutting), from PIE *(s)ker- (to cut). This is one of the most productive roots in Indo-European, producing an enormous family of 'cutting' words. The same root gave Latin 'cortex' (bark — the 'cut-off' outer layer), Greek 'keirein' (to cut, to shear
'Sharp,' 'shirt,' 'skirt,' 'short,' 'shear,' 'share,' 'score,' and 'scar' all come from PIE *(s)ker- (to cut). A shirt is a garment 'cut' from cloth. A skirt is the same word filtered through Old Norse. 'Short' is 'cut off.' 'Share' originally meant a 'cut' of something. 'Score' meant a cut or notch (twenty was marked by cutting a deeper notch). The blade