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Verb: jump the gun
  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

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jump for joy
jump lead
jump off
jump on
jump out
jump out of one's skin
jump rope
jump seat
jump shot
jump suit
jump the gun
jumped-up
jumper
jumper cable
jumper lead
jumpiness
jumping
jumping bean
jumping bristletail
jumping gene
jumping jack