ἢ λέγε τι σιγῆς κρεῖττον ἢ σιγὴν ἔχε → either say something better than silence or keep silence (Menander)
cancel: P. and V. καθαιρεῖν, λύω, λύειν; see cancel.
bring low: P. and V. καθαιρεῖν, καταβάλλειν, συστέλλειν, V. κλίνειν; see bring low, under low.
destroy: P. and V. διαφθείρω, διαφθείρειν; see destroy.
undo: P. ἀγένητον τιθέναι (Plato).