dulco
From LSJ
Χρὴ τῶν ἀγαθῶν διακναιομένων πενθεῖν ὅστις χρηστὸς ἀπ' ἀρχῆς νενόμισται → When a good man is hurt, all who would be called good must suffer with him
dulco: ātus, āre, 1, v. a. id.,
I to sweeten (late Lat.), Sid. Ep. 5, 4; id. Carm. 2, 105.