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 (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.