Origin of digger
- Sense 3, from their use of digging sticks as foraging tools
From American Heritage Dictionary of the English Language, 5th Edition
- Derived from Australian Colonial goldfields terminology. The term represents the mateship of common interests and activities where most of the population were gold miners, and almost everybody was a mate, a "digger", with a common cause against the troopers, the traps, the mining licence inspectors.
- (Australian soldier): Attributed to the considerable time that soldiers spent digging trenches during World War I.