centerline

Etymology

center + line

noun

1. A line through the center that divides a shape into equal pieces.
   It is particularly confusing when the motorist is channelized across the highway centerline. For long-term closures conflicting pavement markings must be removed or obliterated before relaning the roadway. 1978, US Department of Transportation, Traffic control for street and highway construction and maintenance operations
2. (martial arts, boxing) An imaginary line connecting the center of two fighters' bodies while they face each other.
   You might already know that, I don't know, but since you are training at home I didn't want you to be weaving wildly on each side of the rope - the goal is to pop up as tight as possible to the center line. 2005-07-31, Vovchanchyn Fan, “Re: Bob and weaving drill”, in Sherdog (Usenet)
   take his lead leg out from under him. Just dont it when he is going for a power jab, just make sure your heads out of the center line 2006-01-03, Justin Pressley, “Re: having problems whilst sparring”, in Sherdog (Usenet)