ἀποπειρᾶσθαι (apopeirasthai)
ἀποπειρᾶσθαι is an Ancient Greek form of ἀποπειράομαι, meaning “make trial of”. It is the present middle/passive infinitive.
It can also be a form of ἀποπειράζω, “try out, test”.
Found 30 times in the Ancient Greek texts on Socratos.
Where it is used
Thucydides, History of the Peloponnesian War 4.24.3: καὶ ναυμαχίας ἀποπειρᾶσθαι ἐβούλοντο, ὁρῶντες τοῖς Ἀθηναίοις τὰς μὲν παρούσας ὀλίγας ναῦς, ταῖς δὲ πλέοσι καὶ μελλούσαις ἥξειν πυνθανόμενοι τὴν νῆσον πολιορκεῖσθαι.
Flavius Josephus, The Jewish War 5.491: Τίτος δὲ μετὰ τῶν ἡγεμόνων ἐβουλεύετο, καὶ τοῖς μὲν θερμοτέροις πᾶσαν ἐδόκει προσφέρειν τὴν δύναμιν ἀποπειρᾶσθαί τε τοῦ τείχους βίᾳ·
All forms of ἀποπειράομαι (conjugation table)
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Liddell-Scott-Jones, A Greek-English Lexicon (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.