his burden - the Assyrians’ oppression (Isa 9:3). Judah was still tributary to Assyria; Hezekiah had not yet revolted, as he did in the beginning of Sennacherib’s reign.
because of - (Hos 10:15).
the anointing - namely, “Messiah” (Dan 9:24). Just as in Isa 9:4-6, the “breaking of the yoke of” the enemies’ “burden and staff” is attributed to Messiah, “For unto us a child is born,” etc., so it is here. Maurer not so well translates, “Because of the fatness”; an image of the Assyrians fierce and wanton pride drawn from a well-fed bull tossing off the yoke (Deu 32:15). So Isa 10:16 above, and Isa 5:17, “fat ones.”