Longman Dictionary of Contemporary English homepage

Sense: 1-5, 7-8
Origin: French choc, from choquer 'to strike against'
Sense: 6
Date: 1800-1900
Origin: Perhaps from shock 'bunch of cut wheat, corn, etc.' (14-20 centuries), or from shock 'dog with long rough hair' (17-19 centuries)

shock

1 noun
     
shock1 S2 W2
1

unexpected event/situation

[countable usually singular] if something that happens is a shock, you did not expect it, and it makes you feel very surprised, and usually upset
be a shock to discover/find/realize etc that
It was a real shock to hear that the factory would have to close.
Chuck's death came as a complete shock to all of us.
Moving to France was a bit of a shock to the system (=a big shock).
2

unexpected unpleasant feeling

[singular, uncountable] the feeling of surprise and disbelief you have when something very unexpected happens, especially something bad or frightening:
She was shaking with shock and humiliation.
The whole town was still in a state of shock (=extremely shocked by something and unable to think or react normally).
get/have the shock of your life British English (=get a very big shock)
He got the shock of his life when he found out who I was.
shock of (doing) something
Mom's never really gotten over the shock of Dad's death.
They'll get a shock when they get this bill.
Anyone who thinks that bringing up children is easy is in for a big shock (=will have a big shock).
3

medical

[uncountable]MI a medical condition in which someone looks pale and their heart and lungs are not working correctly, usually after a sudden very unpleasant experience:
He was bleeding from the head and suffering from shock.
He is clearly in a state of shock.
The tanker driver was treated for shock and released.
4

electricity

[countable]HPE an electric shock
5

vehicle

[countable usually plural] a shock absorber
6

shock of hair

HBH a very thick mass of hair:
an energetic young man with a shock of red hair
7

sudden change

[countable] a sudden unexpected change which threatens the economic situation, way of life, or traditions of a group of people - used especially in news reports:
the oil shocks of the 1970s
8

shaking

[uncountable and countable] violent shaking caused for example by an explosion or earthquake:
The shock was felt miles away.
shock wave, culture shock, shocked, shell shock, toxic shock syndrome

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