πενθεῖν
From LSJ
καὶ ἐπὶ γῆς εἰρήνη ἐν ἀνθρώποις εὐδοκία → and peace on earth and good will to men, and peace on earth and good will to all
Greek > English (Woodhouse Verbs Reversed)
(see also πενθέω): bewail, lament, assume mourning, make lamentation, mourn for one dead