wǔ
dance
Originally written as 無, which is a pictograph of a person dancing, with ox tails or bird feathers hanging from his arms, to pray for rain. The 舛 (two feet) component was later added to emphasize the action of dancing after 無 was phonetically borrowed for different meanings.
Components
Evolution

Oracle script
(~1250-1000 BC)
Bronze script
Early Western Zhou (~1000 BC)
Seal script
Shuowen (~100 AD)
Clerical script
Eastern Han dynasty (25-220 AD)Regular script
ModernDefinitions
Sources
季旭昇《說文新證》p.472
林志強《《文源》評注》p.203