noun
herd of horses; pack of horses (in a race)
Refers to a group of horses, either in a natural setting or in a race. In racing contexts, it often describes a tight pack of horses running together.
牧場に馬群が走っている。
A herd of horses is running in the pasture.
最終コーナーで馬群が一団となった。
The pack of horses bunched up at the final turn.