A clear line or point where one thing is distinguished from another; a line of demarcation.
Clearly distinguished or demarcated; unambiguous: “[The Supreme Court] rejected bright-line definitions of the onset of life” (Gregg Easterbrook).
(plural bright lines)
- (idiomatic) A clear distinction in the context of a legal or moral judgment.
- In these situations, there is no bright line between aggressive play and outright cheating.
- bright-line rule