ἀντιφονεύω
From LSJ
τοῦ δὲ πολέμου οἱ καιροὶ οὐ μενετοί → in war, opportunities won't wait | the chances of war will not wait (Thucydides 1.142.2)
English (LSJ)
A murder in return, Sch.E.Or.415.
Greek (Liddell-Scott)
ἀντιφονεύω: ἀνταποδίδω φόνον ἀντὶ φόνου, Σχόλ. εἰς Εὐρ. Ὀρ. 415, Ἐπιφάν.
Spanish (DGE)
asesinar a su vez τοὺς φονέας Sch.E.Or.415, Ptol.Gnost.Ep.p.454.21.