D defs.my
Entry 2 senses Webster, 1913

Ducker

/dŭk'-ẽr/ · Duck·er · IPA /dˈʌkər/
01 n. One who, or that which, ducks; a plunger; a diver.
  1. 1.
    One who, or that which, ducks; a plunger; a diver.
  2. 2.
    A cringing, servile person; a fawner.