A bond can be forfeited by order of the court revoking the bond. This may be based on the bondsman filing a motion to be released as the surety, a motion filed by the State, or on the court’s own motion.
If a defendant does not live up to their end of the agreement with their bondsman, perhaps by not staying in contact, the bondsman could “go off” their bond and withdraw their money. That is, the bondsman can ask the court to be released from responsibility of the defendant’s bond.