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What does just fine mean? Can we put it in the context like this:

_How did you make out in your exam?

_Just fine!
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all right, OK
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Hi guys,

'Just fine' means 'no problems, everything was satisfactory.'

'Only' here does not mean 'merely', but rather 'simply'.

We see this in an expression like 'Thank you for the sweater. It fits me just fine.' The speaker is expressing complete satisfaction.

Best wishes, Clive
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Comments  
But what does it mean?
>But what does it mean

quite OK, at the limit of the OK, enough to be acceptable, fairly well
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 Clive's reply was promoted to an answer.
thank you clive