Jump the gun is an idiom that means to act too soon or without proper preparation. It is often used to describe someone who has acted before they should have, or before all the facts are known. The crossword solutions for this term are ANTICIPATE (10 letters), PREMATURE (9 letters), PREEMPT (7 letters), and getahtart (9 letters). ANTICIPATE means to expect or look forward to something, while PREMATURE means happening or done before the usual or proper time. PREEMPT means to take action in order to prevent something from happening, and getahtart is a combination of the words 'GET' and 'a head start'. All of these words can be used to describe the act of jumping the gun.