1
general::
Also, shoot one's wad. Do all within one's power; exhaust one's resources or capabilities. For example, They were asking for more ideas but Bob had shot his bolt and couldn't come up with any, or Don't shoot your wad with that article or you won't have any material for the sequels. The first expression comes from archery and referred to using up all of one's bolts (short, heavy arrows fired with a crossbow); it was a proverb by the 1200s. The colloquial variant, dating from about 1900, comes from gambling and refers to spending all of a wad of rolled-up banknotes. Also see SHOOT THE WORKS.
American Heritage Idioms