a fine line Definition in the Cambridge English Dictionary
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Definition of “a fine line” - English Dictionary

Definition of "a fine line" - American English Dictionary

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a fine line

(also a thin line) a very ​smalldifference between two things that may ​seem different: There’s sometimes a very ​thin line between ​love and ​hate. As a ​comedian, I’m always ​walking that ​fine line between ​humor and ​sarcasm (= ​finding a ​balance between them).
(Definition of a fine line from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "a fine line" - British English Dictionary

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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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