πὺξ παίειν

From LSJ

Τοὺς τῆς φύσεως οὐκ ἔστι λανθάνειν (μανθάνειν) νόμους → Legibus naturae non potest evadier → Naturgesetze keiner insgeheim verletzt

Menander, Monostichoi, 492

Greek > English (Woodhouse)

strike with the fist