1. a fire truck equipped with a water pump and hoses
2. a person or thing that pumps

Examples

• The pumper arrived at the scene within minutes of the alarm.
• Three pumpers responded to the warehouse fire.
• The old pumper was retired after twenty years of service.
• The gas station’s pumper worked all night to fill the underground tanks.
• Each pumper carries hundreds of feet of hose.
• The volunteer fire department bought a new pumper last year.