noun, noun or participle which takes 'suru', intransitive verb
start of a race
Used in horse racing, cycling, track and field, and other competitive racing contexts. Often appears as 発走する or 発走時刻.
レースの発走時刻は午後3時です。
The start time of the race is 3 p.m.
全馬がそろって発走した。
All the horses started together.
Compound of 発 (departure, start) and 走 (running). The reading はっそう follows regular sound changes for 発 (はつ → はっ).