What is "go one on one"

One \One\, n.

1. A single unit; as, one is the base of all numbers.

2. A symbol representing a unit, as 1, or i.

3. A single person or thing. ``The shining ones.''
   --Bunyan. ``Hence, with your little ones.''
   --Shak.

   He will hate the one, and love the other.
   --Matt. vi. 2

4. That we may sit, one on thy right hand, and the other on thy left hand, in thy glory.
   --Mark x. 37.

   After one, after one fashion; alike. [Obs.]
   --Chaucer.

   At one, in agreement or concord. See At one, in the Vocab.

   Ever in one, continually; perpetually; always. [Obs.]
   --Chaucer.

   In one, in union; in a single whole.

   One and one, One by one, singly; one at a time; one after another. ``Raising one by one the suppliant crew.''
   --Dryden.

   one on one contesting an opponent individually; -- in a contest.

   go one on one, to contest one opponent by oneself; -- in a game, esp. basketball.