walk a fine line between something

walk a fine line between (something)

To navigate or strike a balance between two sides, positions, or approaches to something, especially when trying to avoid one of them. The film walks a fine line between parody and homage. As a new parent, you have to walk a fine line between looking out for your child's welfare and being overprotective.
See also: between, fine, line, walk
Farlex Dictionary of Idioms.

walk a fine line between something

or

tread a fine line between something

If someone walks a fine line between two activities or situations, or treads a fine line between them, what they are doing is acceptable, but they are very close to the point at which it would become unacceptable. At present we are walking a very fine line between getting away with it and having a very serious problem. The American will tread a fine line between freshness and a shortage of match fitness. Note: You can also say that you walk or tread a thin line between two things or that you walk or tread a narrow line between them. He must tread a narrow line between investigation of his party's mistakes and charges of disloyalty. Compare with a fine line between something.
See also: between, fine, line, something, walk
Collins COBUILD Idioms Dictionary, 3rd ed.
See also:
  • walk a fine line between (something)
  • walk on a thin line between (something) and (something else)
  • walk a thin line
  • tread/walk a fine/thin line
  • tread a fine line between (something)
  • tread a thin line between (something)
  • street smarts
  • tread/walk a tightrope
  • walk a tightrope
  • off balance