This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 毹 is uncertain. It visually combines 俞 and 毛, but the original semantic and phonetic roles are unclear.
Since the meaning is uncertain, focus on the shape: 俞 on the left and 毛 (fur/hair) on the right. Imagine a furry creature named Yu, but remember the meaning is unclear.
For ユ, use the sound of the left component 俞, which is often read as ユ. Picture a furry 毛 creature called Yu: Yu -> ユ.