We've found 3 phrases for Cannon (0.209 seconds):

Cannon fodder »    Military personnel who are regarded as expendable when attacking the enemy.

Loose cannon »    A cannon that breaks loose during battle or a storm and causes serious damage to the ship and its crew.

Loose cannon »    An uncontrolled or unpredictable person who causes damage to his own friends, faction, political party, etc.

New:  We also know Zip Codes FYI!