shock (n.1)

1560s, "violent encounter of armed forces or a pair of warriors," a military term, from French choc "violent attack," from Old French choquer "strike against," probably from Frankish, from a Proto-Germanic imitative base (compare Middle Dutch schokken "to push, jolt," Old High German scoc "jolt, swing").

Meaning "a sudden blow" is from 1610s; meaning "a sudden and disturbing impression on the mind" is from 1705. Sense of "feeling of being (mentally) shocked" is from 1876. Medical sense is attested from 1804 (it also once meant "seizure, stroke," 1794). Shock-absorber is attested from 1906 (short form shocks attested by 1961); shock wave is from 1907. Shock troops (1917) translates German stoßtruppen and preserves the word's original military sense. Shock therapy is from 1917; shock treatment from 1938.

shock (n.2)

"bundle of grain," early 14c., from Middle Low German schok "shock of corn," originally "group of sixty," from Proto-Germanic *skukka- (source also of Old Saxon skok, Dutch schok "sixty pieces; shock of corn;" German schock "sixty," Hocke "heap of sheaves"). In 16c.-17c. English the word sometimes meant "60-piece lot," from trade with the Dutch.

shock (n.3)

"thick mass of hair," 1819, from earlier shock (adj.) "having thick hair" (1680s), and a noun sense of "lap dog having long, shaggy hair" (1630s), from shough (1590s), the name for this type of dog, which was said to have been brought originally from Iceland; the word is perhaps from the source of shock (n.2), or from an Old Norse variant of shag (n.). Shock-headed Peter was used in 19c. translations for German Struwwelpeter.

shock (v.1)

"to come into violent contact, strike against suddenly and violently," 1570s, now archaic or obsolete, from shock (n.1). Meaning "to give (something) an electric shock" is from 1746; sense of "to offend, displease" is first recorded 1690s.

shock (v.2)

"arrange (grain) in a shock," mid-15c., from shock (n.2). Related: Shocked; shocking.

Definitions of shock
shock (n.)
the feeling of distress and disbelief that you have when something bad happens accidentally;
he was numb with shock
Synonyms: daze / stupor
shock (n.)
the violent interaction of individuals or groups entering into combat;
the armies met in the shock of battle
Synonyms: impact
shock (n.)
a reflex response to the passage of electric current through the body;
subjects received a small electric shock when they made the wrong response
electricians get accustomed to occasional shocks
Synonyms: electric shock / electrical shock
shock (n.)
(pathology) bodily collapse or near collapse caused by inadequate oxygen delivery to the cells; characterized by reduced cardiac output and rapid heartbeat and circulatory insufficiency and pallor;
loss of blood is an important cause of shock
shock (n.)
an instance of agitation of the earth's crust;
the first shock of the earthquake came shortly after noon while workers were at lunch
Synonyms: seismic disturbance
shock (n.)
an unpleasant or disappointing surprise;
it came as a shock to learn that he was injured
Synonyms: blow
shock (n.)
a pile of sheaves of grain set on end in a field to dry; stalks of Indian corn set up in a field;
whole fields of wheat in shock
corn is bound in small sheaves and several sheaves are set up together in shocks
shock (n.)
a bushy thick mass (especially hair);
he had an unruly shock of black hair
shock (n.)
a sudden jarring impact;
all the jars and jolts were smoothed out by the shock absorbers
Synonyms: jolt / jar / jounce
shock (n.)
a mechanical damper; absorbs energy of sudden impulses;
the old car needed a new set of shocks
Synonyms: shock absorber / cushion
shock (v.)
surprise greatly; knock someone's socks off;
Synonyms: floor / ball over / blow out of the water / take aback
shock (v.)
strike with disgust or revulsion;
The scandalous behavior of this married woman shocked her friends
Synonyms: offend / scandalize / scandalise / appal / appall / outrage
shock (v.)
strike with horror or terror;
The news of the bombing shocked her
shock (v.)
collide violently;
shock (v.)
collect or gather into shocks;
shock grain
shock (v.)
subject to electrical shocks;
shock (v.)
inflict a trauma upon;
Synonyms: traumatize / traumatise