Definition: sucking stomach

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Source: Webster's Revised Unabridged Dictionary (1913) 

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

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

   Sucking bottle, a feeding bottle. See under Bottle.

   Sucking fish (Zo["o]l.), the remora. See Remora. --Baird.

   Sucking pump, a suction pump. See under Suction.

   Sucking stomach (Zo["o]l.), the muscular first stomach of
      certain insects and other invertebrates which suck liquid
      food.