συζεύγνυμιsyzeúgnymi

Same root

• σύνsýn · G4862with or together (but much closer than G3326 (μετά) or G3844 (παρά)), i.e. by association, companionship, process, resemblance, possession, instrumentality, addition, etc.
• ζεῦγοςzeûgos · G2201a couple, i.e. a team (of oxen yoked together) or brace (of birds tied together)
• σύζυγοςsýzygos · G4805co-yoked, i.e. (figuratively) as noun, a colleague; probably rather as a proper name; Syzygus, a Christian

Where it appears

Appears 2 times in the Bible.

• Matthew 19:6 Since they are no longer two but one, let no one split apart what God has joined together.”
• Mark 10:9 let no one split apart what God has joined together.”