וְנִקַּ֛ף סִֽבְכֵ֥י הַיַּ֖עַר בַּבַּרְזֶ֑ל וְהַלְּבָנ֖וֹן בְּאַדִּ֥יר יִפּֽוֹל׃ (ס)
And He shall cut down the thickets of the forest with iron, And Lebanon shall fall by a mighty one.
Rashi on Isaiah
And...shall be cut off Heb. וְנִקַּף. This, too, is an expression of cutting, as (ibid.) “Like one who cuts off olives (כְּנֹקֶף).” ואךדר גךכנִקַּף is in the passive voice.
Rashi on Isaiah
the thickets of the forests The prominent branches, symbolizing the heroes.