τραχὺς ἐντεῦθεν μελάμπυγός τε τοῖς ἐχθροῖς ἅπασιν → he is a tough black-arse towards his enemies, he is a veritable Heracles towards his enemies
rĕ-pūbesco: ĕre,I v. inch. n., to grow young again; trop., with revirescere, Col. 2, 1, 4.