A.make trial or proof of . ., τῶν μαντηΐων, τῶν δορυφόρων, Hdt.1.46, 3.128; “ἀ. ἑκάστου εἰ ναυμαχίην ποιέοιτο” Id.8.67, cf. 9.21; ἀ. γνώμης [ἑκάστου] Id.3.119; “τῆς γνώμης ἀποπειρῶ” Ar.Nu.477, cf. And.1.105; “ἀ. τινὸς εἰ δύναιτο ἀληθεύειν” X. Cyr.7.2.17, cf. 2.3.5; ναυμαχίας ἀποπειρᾶσθαι to venture it, Th.4.24: abs., “ἐπεὰν ἀποπειρηθῇ” Hdt.2.73; freq. in Pl., to express the dialectical trial of an opponent, Prt.311b, 349c, al.
II. Act., esp. in Th., “τῆς Καρχηδονίων ἀρχῆς καὶ αὐτῶν ἀποπειράσοντες” 6.90; “ὅπως ναυμαχίας ἀποπειράσωσι” 7.17; ἀποπειρᾶσαι τοῦ Πειραιῶς make an attempt on the Piraeus, etc., 2.93, cf. 4.121: abs., “κατὰ γῆν ἀ.” 4.107, cf. 7.36; “τῶν τειχῶν” App.BC5.36, etc.