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They fortify the city against thee - Under pretense of repairing the walls and towers, they were actually putting the place in a state of defense, intending to seize on the government as soon as they should find Abimelech coming against them. Fortifying the city may mean seducing the inhabitants from their loyalty to Abimelech.

Privily - See the margin. The word is probably the name of a place in “Tormah”, some think the same as “Arumah” Judges 9:41. Zebul was faithful to Abimelech, but dissembled his sentiments, from being too weak to oppose Gaal, until Abimelech came with his army Judges 9:38.

Abimelech intended to punish the Schechemites for slighting him now, but God punished them for their serving him formerly in the murder of Gideon's sons. When God uses men as instruments in his hand to do his work, he means one thing, and they another. That, which they hoped would have been for their welfare, proved a snare and a trap, as those will certainly find, who run to idols for shelter; such will prove a refuge of lies.