Grammar fix
black out
lose consciousness
To lose consciousness for a short time, often suddenly.
phrasal verb
How oftenCommon
LevelB2
Used inSpeech & writing
Hear it in context
Notice where the phrase sounds natural.
I blacked out for a few seconds after standing up too quickly.
I once blacked out briefly during a very hot bus journey, so now I always carry water with me.
Fix the pattern
One small grammar move makes it sound right.
Not: She blacked off during the concert.
Say: She blacked out during the concert.
The expression is 'black out', not 'black off'.
Don't confuse it
Other ways to say it
Suddenly become unconscious for a short time
How formalCasualNeutral
black outYou're here · Lose consciousness; can also mean a memory gap while awake.
pass outEveryday speech about fainting from heat, pain, shock or illness.faintThe neutral word for a brief fainting episode.