Red line (phrase)
The red line, or "to cross the red line", is a phrase used worldwide to mean a figurative point of no return or line in the sand, or "the fastest, farthest, or highest point or degree considered safe."
The red line, or "to cross the red line", is a phrase used worldwide to mean a figurative point of no return or line in the sand, or "the fastest, farthest, or highest point or degree considered safe."