What does "sucking" mean?

Sucking: 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 (Zoöl.), the remora. See Remora. Baird. -- Sucking pump, a suction pump. See under Suction. -- Sucking stomach (Zoöl.), the muscular first stomach of certain insects and other invertebrates which suck liquid food.