Unpredictable jerk (5)
I believe the answer is:
spasm
(Other definitions for spasm that I've seen before include "cramp" , "Pretend to have (injury)" , "Sudden muscular contraction" , "Convulsive action" , "Sudden convulsion" .)
I believe the answer is:
spasm
(Other definitions for spasm that I've seen before include "cramp" , "Pretend to have (injury)" , "Sudden muscular contraction" , "Convulsive action" , "Sudden convulsion" .)