hang fire vs shilly-shally

hang fire

• To wait or hold back. 

• To fail to fire immediately when the trigger is pulled. 

• The situation when a gun does not immediately fire when the trigger is pulled, but may fire shortly after. 

shilly-shally

• To vacillate. 

• To procrastinate. 

• Indecisive; wavering. 

• Indecision; irresolution.