ἐν πέτροισι πέτρον ἐκτρίβων → by grinding stone against stones
P. and V. βλάπτειν, διαφθείρω, διαφθείρειν, φθείρειν, λυμαίνεσθαι (acc. or dat.), P. κακοῦν, V. ἀμαυροῦν.
lessen: P. ἐλασσοῦν; see injure.
