μαρτύρεσθαι
From LSJ
ἢ λέγε τι σιγῆς κρεῖττον ἢ σιγὴν ἔχε → either say something better than silence or keep silence (Menander)
Greek > English (Woodhouse Verbs Reversed)
(see also μαρτύρομαι): invoke, protest, call in as witness, call on, call to witness, call upon, declare emphatically, call upon to testify
Lexicon Thucydideum
obtestari, to beseech, 6.80.3, 8.53.2, [vulgo commonly μαρτυρουμένων]
