Phonosemantic compound. 足 represents the meaning and 甬 represents the sound. Simplified form of 踴.

Evolution

Seal script

Shuowen (~100 AD)

Clerical script

Eastern Han dynasty (25-220 AD)

Clerical script

Eastern Han dynasty (25-220 AD)

Clerical script

Eastern Han dynasty (25-220 AD)

Regular script

Modern