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English definition of “a fine line”

a fine line

C1 If you say that there is a fine line between one thing and another, you mean that they are very similar. You often say this when one thing is acceptable and the other is not: As a parent, I knew that there was a fine line between panic and caution.
(Definition of a fine line from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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