I was sort of searching for where "Blacks out" (losing consciousness) the saying came from. I don't think I found that but here is other stuff

 

I can remember fainting at least twice in my life and the first one I was about 8 years old and I had gotten sand in my ears at the beach and the ear doctor had to get the sand out of my ears and this upset my equilibrium and I fainted going down in the elevator with my mother after the doctor washed out all the sand from my ears so I could hear again from the doctor's office then. 

The second time this happened was caused by playing football and wrenching something in my neck while playing. So, when I was 12 I was singing in my parent's church's Choir and up on risers in front of an audience likely singing for a Christmas occasion. Because I was 12 it took my father's help to survive this. Luckily, he was standing next to me about 4 feet off the ground in the Bass section of the choir and I didn't know what to do as everything turned white and I couldn't see anymore. When I pitched off the 4 foot riser backwards my father immediately jumped down onto the floor behind the riser and caught my head so I didn't die from cracking my head on the floor while blacked out.

Later, he took me to a Japanese Jin Shin Jyutso (acupressure) master and she cured the problem and I saw colors as my nerve pinch in my neck ended. I saw a lot of green and blue swirling colors as the nerve pinch was corrected by this Acupressure treatment from a Japanese Master of Acupressure.

Note: Acupressure is Acupuncture without the needles. It takes more time than acupuncture but often can be more effective and more of a complete healing than Acupuncture can. So, most people know acupuncture because it is a better more well known treatment in the U.S. than acupressure. 

begin quote:

 

"Blacks out" refers to a temporary loss of consciousness (fainting/syncope) or a temporary loss of memory (amnesia) while conscious, often caused by alcohol, low blood pressure, or medical conditions. It can also mean erasing information, a power failure, or a total lack of light. 

Key details regarding "blacking out":

• Alcohol-Induced Blackout: A "memory blackout" happens when high alcohol consumption (binge drinking) prevents the brain from creating new memories, even while the person remains awake and functional. These are often "en bloc" (complete memory loss).
• Loss of Consciousness (Passing Out): This is a temporary loss of consciousness, often called fainting or syncope.
• Physical/Medical Causes
  :
  Blackouts can stem from low blood pressure, stress, epilepsy, or underlying health issues, necessitating medical attention.
Other Definitions: It can mean censoring text, turning off all lights in a building/city (wartime), or a broadcast cancellation. 

When to Seek Help: If blackouts occur, especially if they are sudden or frequent, it is essential to consult a doctor. 

• Interrupted Memories: Alcohol-Induced Blackouts

  Complete amnesia, often spanning hours, is known as an “en bloc” blackout. With this severe form of blackout, memories of events d...

  

  

  National Institute on Alcohol Abuse and Alcoholism (NIAAA) (.gov)

• 
  

Show all

Blackouts - Healthdirect

Blackouts * A blackout is a temporary loss of consciousness. * Blackouts are sometimes called fainting, collapsing or passing out.

Healthdirect

Blackout Drunk: Signs, Causes, and Dangers of Blackout Drinking

People often confuse “blacking out” with “passing out” (aka syncope), which is a temporary loss of consciousness when someone no l...

American Addiction Centers