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under no circumstances

Meaning: If you are told that under no circumstances should you do something, you must never do it, no matter what happens.

For example:

  • If the red light is on outside the studio, under no circumstances is anyone to go in there. It means they're recording a song.

  • This is a dangerous drug, so under no circumstances is it to be left anywhere in the hospital that members of the public could access.

Quick Quiz:

Under no circumstances can this door be left open. You
  1. mustn't leave it open
  2. ought to leave it open
  3. should never open it

Discuss: under no circumstances

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