jolt (
http://definr.com/jolt)
n 1: a sudden impact; "the door closed with a jolt" [syn:
jar,
jounce]
2: an abrupt spasmodic movement [syn:
jerk,
jerking]
v 1: move or cause to move with a sudden jerky motion [syn:
jar]
2: disturb (someone's) composure; "The audience was jolted by
the play"