This is the 2230th most frequent Polish word.
ruszyli
"Ruszyli" means "they moved" or "they set off" in English.
Here, 'ruszyli' refers to a group of people deciding to start walking or moving towards a destination.
Po długim oczekiwaniu wszyscy ruszyli na peron.
After a long wait, everyone moved to the platform.
In this context, 'ruszyli' indicates the horse beginning to move quickly or start an action – specifically, galloping.
Koń ruszył galopem po otwarciu bramy.
The horse started galloping after the gate was opened.
Here, 'ruszyli' is used to describe students starting to walk towards their class after a signal.