shù, zhú
art, skill
Original meaning:
city road
Phonosemantic compound. 行 represents the meaning and 朮 represents the sound. Based on the original meaning "city road". The meaning later shifted to "way", "method", "technique", and "skill".
Evolution

Seal script
Shuowen (~100 AD)
Clerical script
Eastern Han dynasty (25-220 AD)Regular script
ModernDefinitions
Sources