D defs.my
Entry 2 senses Webster, 1913

Bottleholder

· Bot·tle·hold·er · IPA
01 n. One who attends a pugilist in a prize fight; -- so called from the bottle of water of which he has charge.
  1. 1.
    One who attends a pugilist in a prize fight; -- so called from the bottle of water of which he has charge.
  2. 2.
    One who assists or supports another in a contest; an abettor; a backer.[Colloq.]
    “Lord Palmerston considered himself the bottleholder of oppressed states.” — The London Times.