“Mouth” is here used metaphorically for “boastfulness.” It is an expostulation against Gaal’s past rashness and audacity. Although Zebul still seems to be in no position openly to oppose Gaal for fear of his own personal safety, yet he does, by his taunts before bystanders, goad Gaal to fulfill his boast (v. 28) by going out to fight with Abimelech’s forces. Insolent, boastful men are often made to change their rash attitude in a brief time, and to dread those whom they have previously insulted.