centerline

• centreline, centre line

center +‎ line

centerline (plural centerlines)

1. A line down the center of a road, generally one that divides traffic moving in opposite directions.
   • 1978, US Department of Transportation, Traffic control for street and highway construction and maintenance operations:

     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.

2. (martial arts, boxing) An imaginary line connecting the center of two fighters' bodies while they face each other.
   • 2005 July 31, Vovchanchyn Fan, “Re: Bob and weaving drill”, in Sherdog‎ (Usenet):

     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.

   • 2006 January 3, Justin Pressley, “Re: having problems whilst sparring”, 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

• centreline