Question 1

What does "go off on one" mean?

Accepted Answer

To suddenly begin an angry, excited, or lengthy rant, often in an exaggerated or dramatic way.

Question 2

How do you use "go off on one" in a sentence?

Accepted Answer

She went off on one when she found out the event had been cancelled without warning.

Question 3

Is "go off on one" formal or informal?

Accepted Answer

"go off on one" is register-neutral — appropriate in both casual and formal contexts. Distinctly British English slang. Often describes someone who overreacts or becomes disproportionately angry or passionate about something. Can be used with some affection or humour. The 'one' is an unstressed fixed part of the expression and cannot be replaced.

go off on one

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