- The definition of full bore is operating at the highest speed or power.
An example of full bore is a racecar that is driving at the highest speed that it can go.
to the greatest degree or extent; at full speed, with the greatest power or effort, etc.: a factory running full-bore
complete or thorough; all-out: a full-bore effort
Complete; thoroughgoing: “a full-bore investigation into the damaging leak” (Tom Morganthau).