1. (informal) to act or begin too soon or without due caution 
2. To begin a race too soon, before the starting gun goes off

Derived forms: jumped the gun

• arteritis
• artery
• artery of the labyrinth
• artery of the penis bulb
• artery of the vestibule bulb
• artesian
• artesian well
• artful
• artfully
• artfulness
• arthralgia
• arthralgic
• arthritic
• arthritis
• arthro-
• arthrocentesis
• arthrodesis
• arthrogram
• arthrography
• arthromere
• arthromeric
• arthropathy
• arthroplasty
• arthropod
• arthropod family