Plural form of blueline; the two blue lines on an ice hockey rink that define playing zones.
Standard English pluralization of 'blueline' (blue + line + s).
Professional hockey players are so precise with the blue line that they can feel its position through the ice—a tiny edge advantage at the blue line can mean the difference between a legal play and an offsides penalty.
Complete word intelligence in one call. Free tier — 50 lookups/day.