To start a new job, project, or activity with immediate effectiveness and energy, without needing time to adjust or prepare.
This phrase has military origins, dating back to World War II paratroopers who needed to be ready for action the moment they landed. The expression emphasized the importance of being prepared to fight immediately upon touching down, rather than needing time to orient themselves after landing.
The paratrooper origin creates a vivid image of the transition from preparation to action - there's no luxury of a gentle start when you're literally falling from the sky into a combat zone. This military heritage explains why the phrase carries connotations not just of speed, but of competence under pressure and thorough preparation.
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