Idiom Breakdown

under no circumstances

English negative polarity items

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Definition

Never ever, not for any reason.

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"Under no circumstances should I be responsible for your reckless driving of my vehicle."
"From time to time deputations from the town urged the construction of a more central station, and in November, 1842, the directors announced that a temporary station at the south end of the viaduct would be erected as early as practicable, and the experiment fairly tried, but that under no circumstances would the company consent to the expense of having two passenger stations at Stockport."

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