miǎn
parapet
Original meaning:
to not be seen
Depicts a person (人) with a cover on top, conveying the original meaning "to not be seen". The meaning later shifted to "invisible" and "parapet".
Evolution

Bronze script
Late Shang dynasty (~1100 BC)
Seal script
Chu (Warring States: 475-221 BC)
Seal script
Shuowen (~100 AD)Regular script
ModernDefinitions
Sources
季旭昇《說文新證》p.701