kǎi

sharpen

Components
岂 sound component

  Sound component

kǎi

  

victorious music, happy

刂 meaning component

  Meaning component

dāo

  

knife

knife

Evolution

剀 Seal script Chu (Warring States: 475-221 BC)

Seal script

Chu (Warring States: 475-221 BC)
剀 Seal script Shuowen (~100 AD)

Seal script

Shuowen (~100 AD)
剀 Simplified script Modern

Simplified script

Modern
Definitions

() 

kǎi

sharpen; carefully, thorough; carefully; moderately