Noun
fine line (plural fine lines)
(idiomatic) A difference, albeit vague and difficult to discern.
Antonym: bright line
Avery Rozinka (left) and Lindsie McKusick clean the stair banisters Thursday, May 28, at The Fine Line Salon and Spa in Brainerd. Source: Internet
What's going to be poppin' beside bottles at the Fine Line? Source: Internet
Fine Line Printing completed the first run of 1,500 HOURS and 1,500 Half HOURS in October 1991. Source: Internet