Meaning of “a fine line” in the English Dictionary

american-english dictionary

"a fine line" in British English

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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 Learner’s Dictionary & Thesaurus © Cambridge University Press)

"a fine line" in American English

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a fine line

also a thin line

a very small difference 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)