“Daughter Zion.” The Hebrew is idiomatic for Zion itself, i.e., Jerusalem (see commentary on Isa. 1:8).
“I will make your hoofs bronze.” This is a zoomorphism, using the figure hypocatastasis and comparing Israel to a cow or ox treading grain. [For more on hypocatastasis, see commentary on Revelation 20:2].
“devote.” That is, devote them to Yahweh as an offering. [For more on things “devoted” to Yahweh, see commentary on Josh. 6:17].