Sucking fish

from WordNet (r) 3.0 (2006)

sucking fish
    n 1: marine fishes with a flattened elongated body and a sucking
         disk on the head for attaching to large fish or moving
         objects [syn: {remora}, {suckerfish}, {sucking fish}]

from The Collaborative International Dictionary of English v.0.48

Sucking \Suck"ing\, a.
   Drawing milk from the mother or dam; hence, colloquially,
   young, inexperienced, as, a sucking infant; a sucking calf.
   [1913 Webster]

         I suppose you are a young barrister, sucking lawyer, or
         that sort of thing.                      --Thackeray.
   [1913 Webster]

   {Sucking bottle}, a feeding bottle. See under {Bottle}.

   {Sucking fish} (Zool.), the remora. See {Remora}. --Baird.

   {Sucking pump}, a suction pump. See under {Suction}.

   {Sucking stomach} (Zool.), the muscular first stomach of
      certain insects and other invertebrates which suck liquid
      food.
      [1913 Webster]