καταθαρσ-έω · katathars-eō — LSJ
to be confident, in pf. part., Plb. 1.40.3; κ. τοῖς ὅλοις looking forward confidently to a complete victory, Id. 3.86.8; κατεθάρσησεν ὁ λαὸς ἐπὶ τοῖς λόγοις LXX 2 Ch. 32.8: c. inf., make bold to . . , παρεπιδείκνυσθαι δημοσίᾳ τὸ ἀνοσιούργημα Ph. 2.220; τοῖς ὕδασι παραδοῦναι σφᾶς αὐτούς Agath. 3.20.
c. gen., behave boldly against, τῆς τῶν Σπαρτιατῶν δυνάμεως D.S. 15.34; χώρας Str. 12.8.6.
Pass., to be confirmed, Cod.Just. 9.4.6.5.