initial dash; burst of speed at the start of a race
Refers specifically to the explosive acceleration right after the start in short-distance races.
wasei-eigo (Japanese-coined English), from start dash
He took the lead with a burst of speed at the start.
going all out from the beginning; charging ahead at full strength from the start
Figurative use for any situation where someone begins with maximum effort, not limited to sports.
The new employee is working hard to produce results right from the start.