This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
骮 combines 骨 (bone) with 弋, but the exact historical development is uncertain. It may be a phono-semantic compound, but the role of 弋 is unclear.
The left side 骨 means bone, and the right side 弋 looks like a small stake or arrow. Picture a small bone fragment or splinter, but the exact meaning is unclear.
For ヨク, imagine a yoke made of bone: yoke -> ヨク, though the connection is artificial.