si4
team of 4 horses

strokes 15
radical
strokes after radical 5
君子一言,驷马难追 君子一言,駟馬難追 jun1 zi3 yi1 yan2 - si4 ma3 nan2 zhui1
a nobleman's word is his bond (proverb)

一言既出,驷马难追 一言既出,駟馬難追 yi1 yan2 ji4 chu1 - si4 ma3 nan2 zhui1
lit. once said, a team of horses cannot unsay it (idiom); a promise must be kept