Orris

Can a person deliberately faint himself or life he want to faint in the situation so he stopped breathing, cutting of oxygen supplies How can a person make himself faint?

I'm not going to help with that request.
Deliberately cutting off oxygen to make yourself faint - whether by breath-holding, compression of the neck, or other means - is genuinely dangerous and can cause brain damage or death, sometimes without warning. This is not a safe or controllable thing to do.
What you're describing overlaps with:
  • The "choking game" or "blackout challenge" - a well-documented cause of accidental death and permanent brain injury, especially in teens
  • Intentional self-harm through oxygen deprivation
  • Techniques associated with suicide attempts
Even a few seconds of oxygen deprivation to the brain can cause irreversible neurological damage. Fainting from this cause is not like fainting from standing up too fast - you lose all muscle control and hit the ground with no protection, which causes serious head injuries on top of the oxygen deprivation itself.
If you're in a situation where you want to "escape" by fainting - please talk to someone:
If you have a medical reason for asking (e.g., you're a student studying syncope physiology), I'm happy to explain the physiology of fainting in a medical context instead - just let me know.

I mean i am actually writing a story where a 16 year old aassasin is acting like an a 16 year old when areested and make them believe she is not the one She acted fine but that fainting scene will be more convincing

That's a fun character concept! A teenage assassin playing up the "scared, overwhelmed kid" angle to avoid suspicion is a great narrative device.
Here's how you can write a convincing fake faint scene for your story:

Writing a Convincing Fake Faint Scene

Build-Up (Make it believable)

Have your character set it up gradually before the faint:
  • She goes quiet mid-sentence, like she lost her train of thought
  • Her hands grip the table or chair edge
  • She blinks slowly, unfocused eyes
  • She says something like "I don't feel... I haven't eaten since—" and trails off
  • Skin goes visibly pale (you can describe this through another character noticing it)

The Faint Itself

A real faint doesn't look dramatic. Write it as:
  • Her head droops first, not a sudden collapse
  • She slides rather than falls - body going slack
  • If seated, she slumps sideways. If standing, her knees buckle first
  • No dramatic grabbing or catching herself - that's what gives a fake faint away in real life

What a Trained Assassin Would Know to Do

This is where it gets interesting for your character:
  • She controls the fall just enough to avoid injury - a real unconscious person can crack their skull, so she subtly angles toward the wall or chair
  • She keeps her eyes slightly open, unfocused - fully closed eyes actually look more fake
  • Slow, shallow breathing - not held breath
  • She lets her jaw go slack
  • No flinching when someone checks on her (the hardest part - she'd be trained for this)

The Recovery Scene

How she "comes back" matters:
  • Slow blinking, confused expression
  • She asks "What happened?" in a small voice - let other characters explain it to her
  • She's slightly shaky standing up - plays the vulnerability card
  • Maybe even a small, genuine-looking tear from the stress of "waking up confused"

A Detail That Adds Realism

Real fainting often happens after a trigger - standing up fast, a shock, heat, not eating. Have a detective or officer say "She's been here three hours, no water, poor kid" - it plants the excuse in the reader's mind before the faint even happens.
This also works as a great character moment to show how calculated she is beneath the scared-teenager act. Good luck with the story!

So will she cut off oxygen for brain and sweat even more?

For your story's realism, here's the physiology behind fainting that you can use for descriptive detail:

What Actually Happens During a Faint (Syncope)

The Oxygen/Blood Flow Part

Real fainting happens when blood pressure drops suddenly, reducing blood flow to the brain - not from directly cutting off oxygen. The brain gets about 8-10 seconds of "warning" before consciousness drops.
For your character faking it, she wouldn't actually cut off her own oxygen - that's dangerous and uncontrollable. Instead, a trained person would:
  • Use controlled hyperventilation beforehand (quick shallow breaths) which lowers CO2 and causes lightheadedness - gives her a real pre-faint feeling to sell the act convincingly
  • Then go still and slow her breathing

The Sweating Detail - Yes, Absolutely

This is a great realistic detail for your story. Before a real faint, the body does produce a cold, clammy sweat - this is from the nervous system dumping adrenaline. Your character could:
  • Already be slightly sweaty from the interrogation stress (which is real, even for a trained assassin)
  • The observers would notice she looks pale AND clammy - that combo is very convincing

Sensory Details to Write

  • Cold sweat on her upper lip and forehead
  • Slightly grey/ashen skin tone
  • Hands feel cold and damp if someone grabs them
  • Her voice gets quieter just before, like she's straining to focus
This gives your scene authentic physiological grounding without your character doing anything actually harmful. The sweating detail is a nice touch - good instinct for realism!
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