fine line

American  

[fahyn lahyn] / ˈfaɪn ˈlaɪn /

noun

1. a small, barely perceptible difference.

   There's often a fine line between helping and interfering.

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idioms

1. walk a fine line,

   1. to act carefully in order to avoid the wrong outcome or maintain a delicate balance.

      Moderators walk a fine line between censorship and protecting their site's users.

      I had to walk a fine line between maintaining the peace and doing my job.

   2. to act in a way that risks a disastrous outcome.

      You’re walking a fine line, buddy—if you don’t start watching your mouth, you’ll lose the respect of your kids.

Etymology

Origin of fine line

First recorded in 1845–50

Example Sentences

See Examples For:

fine line

There is a fine line between being fresh and being undercooked, though.

From BBC ● Jun. 17, 2026

There’s a fine line between lucky and cursed, however, and Pulisic is straddling it.

From Los Angeles Times ● Jun. 7, 2026

Crisis strikes the kitchen when our forgotten, shelved-away ingredients teeter on the fine line between fresh and spoiled.

From Salon ● May 30, 2026

It is such a fine line with every person on how to approach them.

From MarketWatch ● May 29, 2026

He walked a fine line filling out the form: making the launch date and flight path clear, while doing everything possible to "conceal state secrets."

From "The Martian" by Andy Weir