01 a. Drawing milk from the mother or dam; hence, colloquially, young, inexperienced, as, a sucking infant; a sucking calf.
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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.