παραθαρσύνειν
From LSJ
οἱ τοῖς πέλας ἐπιβουλεύοντες, λανθάνουσι πολλὰκις ὑφ' ἑτέρων τοῦτ' αὐτὸ πάσχοντες → when people plot against their neighbours, they fall victim to the same sort of plot themselves
Greek > English (Woodhouse Verbs Reversed)
(see also παραθαρσύνω): cheer, embolden, encourage
Lexicon Thucydideum
confirmare, to strengthen, 4.115.1, 5.4.6, 5.8.5, 7.2.1, 8.77.1.