In the book 数学ガール ガロア理論, the phrase くびきを共にする, which I would infer means something like "to yoke together", appears repeatedly as a metaphor for phenomena where a number of elements are related.
Some google hits for the phrase can be found in a religious context (e.g. イエス様とくびきを共にする "Be joined to Jesus (as with a yoke)").
But why is くびき the object in this phrase? I would expect くびき to be the instrument or means of yoking (the yoke itself) rather than an object.