fine line
Meaning
A very small difference or boundary between two similar things, often where it’s easy to go too far into the wrong one.
Origin
From the literal idea of a thin, hard-to-see line marking a boundary; by the 20th century it was common figuratively for subtle distinctions (e.g., right vs. wrong, helpful vs. intrusive).
Notes
Often used to warn that two things are very close and it’s easy to cross into the negative (e.g., funny vs. offensive). Common in “a fine line between A and B.”
Examples
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There's a fine line between being confident and being arrogant.
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As a manager, she walks a fine line between being friendly and staying professional.
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The movie treads a fine line between comedy and tragedy, and it mostly works.
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In negotiations, there's a fine line between standing firm and being unreasonable.
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When giving feedback, be careful—there's a fine line between honesty and cruelty.
Grammar & Usage Notes
Usually with an article: “a fine line.” Most common patterns: “a fine line between A and B,” “walk/tread a fine line,” “draw a fine line (between…).” Adjective “fine” is fixed.
Synonyms
- a thin line
- a narrow margin
- a subtle distinction
- a delicate balance
Antonyms
- a clear difference
- a wide gap
- a clear-cut distinction