וַיַּכְרֵ֨ת יְהוָ֜ה מִיִּשְׂרָאֵ֗ל רֹ֧אשׁ וְזָנָ֛ב כִּפָּ֥ה וְאַגְמ֖וֹן י֥וֹם אֶחָֽד׃
Therefore the LORD doth cut off from Israel head and tail, palm-branch and rush, in one day.
Rashi on Isaiah
a large arch and a small arch An expression denoting kings and sultans.
Ibn Ezra on Isaiah
The people did not return to the Lord, because there was none to show them the right way.
Rashi on Isaiah
כִּפָּה, arcum voltum, arvolt in O.F. [an arch] i.e., those who hover over them like an arch.