懂中文 Dong Chinese

驷

sì

team of four horses

Four 四 horses 马; 四 also provides the pronunciation

Components
马 meaning component

马  Meaning component

mǎ

  

horse

四 sound,meaning component

四  Sound Meaning component

sì

  

four

Evolution

驷 Bronze script Early Spring and Autumn (~700 BC)

Bronze script

Early Spring and Autumn (~700 BC)
驷 Seal script Shuowen (~100 AD)

Seal script

Shuowen (~100 AD)
驷 Clerical script Western Han dynasty (202 BC-9 AD)

Clerical script

Western Han dynasty (202 BC-9 AD)
驷 Traditional script Modern

Traditional script

Modern
驷 Simplified script Modern

Simplified script

Modern
Definitions

驷 (駟) 

sì

team of four horses; team of 4 horses