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

• not-for-profit
• nota bene
• notability
• notable
• notably
• notarial
• notarise
• notarize
• notary
• notary public
• notate
• notation
• notational system
• notch
• notched
• note
• note of hand
• note payable
• note receivable
• note value
• notebook
• notebook computer
• notebook entry
• notecase
• Notechis