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

• Merginae
• merging
• Mergus
• Mergus albellus
• Mergus merganser
• Mergus merganser americanus
• Mergus serrator
• mericarp
• meridian
• meridional
• meringue
• meringue kiss
• merino
• merino sheep
• Meriones
• Meriones longifrons
• Meriones unguiculatus
• meristem
• merit
• merit badge
• merit pay
• merit system
• meritable
• merited
• meritless