yokefellow

noun2

1. •
   A companion; a fellow labourer, a person who works at the same task as another.

   • I’ll see their trial first. Bring in their evidence. / [To Edgar] Thou, robed man of justice, take thy place. / [To the Fool] And thou, his yokefellow of equity, / Bench by his side. — 1603
2. •
   (no longer used) Someone joined in marriage to another; a spouse.

   • [H]is industrious yoke-fellow executed every circumstance of the plan she had projected; so that, when he recovered his vision, he was an utter stranger in his own house. — 1751