zhèn
press down, town
Phonosemantic compound. 金 represents the meaning and 真 represents the sound.
Evolution

Seal script
Shuowen (~100 AD)
Clerical script
Western Han dynasty (202 BC-9 AD)
Seal script
Western Han dynasty (202 BC-9 AD)
Clerical script
Eastern Han dynasty (25-220 AD)Regular script
ModernDefinitions
Sources