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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.
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2015-09-15T10:34:14.627
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syntax
Syntax of くびきを共にする
Are you confused because you think 「食事を共にする」 is the same as 「共に食事する」?

「食事を共にする」 is [to share] [meal], not [to eat] [together].

This is more obvious in phrases like 「運命を共にする」「生死を共にする」, where 運命 and 生死 are
clearly not verbs. (You don't say 運命する or 生死する)

So 「くびきを共にする」 is [to share] [a yoke].

[![Sharing a
yoke](https://i.stack.imgur.com/pD2pv.jpg)](https://i.stack.imgur.com/pD2pv.jpg)
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