fast cow; fast ox
A straightforward compound meaning a cow or ox that is fast. Not a common standalone term; likely encountered in specific contexts such as names, stories, or metaphorical use.
I hear there is a fast cow at that farm.
Compound of 早 (はや, 'fast') and 牛 (うし, 'cow/ox'). The exact origin is uncertain; it may be a descriptive term or a proper noun.