frš - to lie; IV. to speak an evil of somebody in his absence; VIII. to treat one's honour as a thing which is allowable to attack, by speaking evil of him
(Lane 2370)
Possibly related to Akk. parāˀu ‘to slice, to slit’. This is a good match from the semantic point of view, but the word-final “strong aleph” in Akkadian is unlikely to correspond to -y in Arabic (EDA I 226)