lose consciousness

lose consciousness — idiom

1. to suddenly stop being awake and aware of your surroundings, usually because of

1.慣用語B1
釋義

to suddenly stop being awake and aware of your surroundings, usually because of a drop in blood pressure, shock, heat, or strong emotion — for example, fainting in a hot room or passing out after receiving bad news.

例句

The heat inside the train was so unbearable that an elderly passenger lost consciousness and collapsed.

lose consciousness + and + verb of collapse

Romi lost consciousness for a few seconds after standing up too quickly, then felt fine.

adverbial of duration: for a few seconds

同義詞
  • pass out

    informal; the most common everyday alternative

  • faint

    specifically from reduced blood flow to the brain; suggests recovery is quick

  • black out

    implies a temporary loss of memory along with consciousness, often from alcohol or a blow

反義詞

文法句型

lose consciousness + when/because clause

用法筆記

Common with adverbials of duration (for a moment, briefly) or circumstance (from heat, from shock). The shorter, informal equivalent is pass out.

常見錯誤

❌She lost her consciousness after falling.
✅She lost consciousness after falling.
💡consciousness is uncountable; no possessive determiner is used.
❌He lost his conscious and fell.
✅He lost consciousness and fell.
💡conscious is an adjective; the noun form consciousness is needed.

2. to enter a state in which you cannot see, hear, feel, or think, typically result

2.慣用語B1
釋義

to enter a state in which you cannot see, hear, feel, or think, typically resulting from a head injury, a medical condition, anaesthesia, or a severe physical event — used in both medical contexts and everyday descriptions of serious incidents.

例句

The cyclist lost consciousness after hitting his head on the pavement and was rushed to hospital.

lose consciousness + after + cause of injury

Patients who lose consciousness during a seizure need immediate medical attention.

during + [medical event]

同義詞
反義詞

文法句型

lose consciousness + due to [cause]

consciousness is lost + when [condition]

用法筆記

Frequently describes the result of trauma, stroke, seizure, sedation, or poisoning. In medical charts, the shorter form LOC is sometimes used as an abbreviation.

常見錯誤

❌The doctor said he lost his conscious during the operation.
✅The doctor said he lost consciousness during the operation.
💡Use the noun consciousness, not the adjective conscious.