false start; jumping the gun
Wasei-eigo from 'flying start', used for starting before the signal in races or acting prematurely in general situations.
wasei-eigo (Japanese-coined English), from flying start
He was disqualified for a false start.
He jumped the gun at the meeting and started talking about things that hadn't been decided yet.
flying start; running start
Used in sports for a start where the athlete is already moving when crossing the starting line, or figuratively for a quick beginning.
In sprinting, a flying start is not allowed.
The new product got off to a flying start and increased sales.
early broadcast; starting a program a few minutes early
Broadcasting term for beginning a TV or radio program slightly before the scheduled time.
The program started two minutes early with a flying start.