Let us go up against Judah, and vex it, and let us make a breach therein for us, and set a king in the midst of it, even the son of Tabeal:
Let us go up against Judah, and vex it - throw it into consternation (Gesenius) [nªqiytsenaah, from quwts (H6972), to affect with weariness]. Let us weary it out with a long siege (Mercer). So the same verb means in Proverbs 3:11.
Let us make a breach - rather, cleave it asunder. The Hebrew verb baaqa` (H1234), to divide in two. Their scheme was to divide a large portion of the territory between themselves, and set up a vassal-king of their own over the rest. Son of Tabeal - unknown; a Syrian sounding name, perhaps favoured by a party in Jerusalem (Isaiah 8:6; Isaiah 8:9; Isaiah 8:12).