«فَاهْجُرْ ... هَجْرَ الْقِلَى»
Then leave ... a leaving marked by profound estrangement.
Uhjur is a second-person masculine singular imperative; hajr is a verbal noun from the same root. The verbal noun intensifies or specifies the kind of act, an example of the cognate accusative pattern.
Here “wahabhu” means “suppose or consider him,” followed by the simile “kal-malḥūd.” The two imperatives create a forceful admonitory tone rather than a detached observation.