Weren't you scared? Did you lose consciousness?

你当时不害怕吗，有没有失去知觉呢？

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When you "black out," you temporarily lose consciousness.

当你“黑掉(blackout)”，就是说你暂时失去了知觉。

youdao

They might lose consciousness or even suffer a heart attack.

他们可能回失去意识，甚至引起心脏病发作。

youdao

They might lose consciousness or even suffer a heart attack.

VOA: special.2009.07.14

While in the hospital's accident and emergency department Mr Cook's nose started to bleed and he began to lose consciousness.

BBC: High Court in Edinburgh

You can be fully aware, you can lose total consciousness or anywhere in between.

CNN: Seizures: When 'electrical brainstorm' hits

Mr Venables has returned into public consciousness just as New Labour seems set to lose office, an eerie bookend to its political supremacy.

ECONOMIST: Bagehot