sucking /ˈsʌkɪŋ/adjective 2noun 2forms 1 adjective2 •(no longer used) Still nourished by the mother's milk, as an infant; suckling. •(figurative, no longer used) Young and inexperienced.Rather a shy place for a sucking county member, ay, Pynsent? — 1848 noun2 •An act of sucking. •A sound or motion that sucks. formssuckings