Rare horse character

It is a rare horse character, chiefly found in 駃騠.

The Shiji, an early Chinese history compiled about 91 BCE, is an early written witness: it lists 駃騠 among unusual livestock associated with Xiongnu pastoral life. Shuowen Jiezi, an early Chinese character dictionary, glosses the compound as the offspring of a male horse and 驘, an old mule term. A commentator from the Qing dynasty, Duan Yucai, argued that the gloss had dropped “female donkey”; later dictionary entries specify a male horse and female donkey. Other old glosses call 駃騠 a fine or swift horse.

Shuowen analyzes 駃 as 馬 (“horse”) plus 夬, a sound component, and notes an old use alongside 快 (“fast”). Dictionaries also give 駃 a separate literary sense, “swift.”

What does 駃 mean when someone sends it?

A lone 駃 is too context-poor to decode confidently.

Look for the word it belongs to. In 駃騠, old dictionaries disagree between the hybrid-animal and swift-horse glosses; in classical phrases about rain, flow, or movement, 駃 can mean swift. A bare 駃 does not settle which sense applies.