νέῳ δὲ σιγᾶν μᾶλλον ἢ λαλεῖν πρέπει → it's fitting for a young man to keep silence rather than to speak (Menander)
ăd-aucto: āre, 1,
I v. freq. adaugeo, to augment much: rem summam et patriam nostram, Att. ap. Non. 75, 3 (Rib. Trag. Rel. p. 283).
ădauctō, āre, fréq. de adaugeo, augmenter, accroître : Acc. d. Non. 75, 2.