Etymology
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jolt (v.)

1590s (transitive), perhaps from Middle English jollen, chollen "to knock, to batter" (early 15c.), or an alteration of obsolete jot (v.) "to jostle" (1520s). Perhaps related to earlier jolt head "a big, stupid head" (1530s). Intransitive sense from 1703. Figurative sense of "to startle, surprise" is from 1872. Related: Jolted; jolting.

jolt (n.)

1590s, "a knock," from jolt (v.). Meaning "a jarring shock" is from 1630s.

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Definitions of jolt
1
jolt (v.)
move or cause to move with a sudden jerky motion;
Synonyms: jar
jolt (v.)
disturb (someone's) composure;
The audience was jolted by the play
2
jolt (n.)
a sudden jarring impact;
the door closed with a jolt
all the jars and jolts were smoothed out by the shock absorbers
Synonyms: jar / jounce / shock
jolt (n.)
an abrupt spasmodic movement;
Synonyms: jerk / jerking / saccade
From wordnet.princeton.edu