sè
unsmooth
Original meaning:
to not move smoothly
Quadruple of 止. Used here to convey the original meaning "to not move smoothly". Original form of 澀.
Components
Evolution

Seal script
Shuowen (~100 AD)Regular script
ModernComponent uses
Simplified component in 1 character (1 verified)
Sources
李学勤《字源》p.108
"The Complete Guide to Japanese Kanji" p.433