disunite

To cause disagreement or alienation among or within.

If they cannot disunite them by domestic broils, then they engage their neighbours against them.

Secrets disunite a family.

To separate, sever, or split.

I have discovered how to disunite that force and that particle.

To disintegrate; to come apart.

You cannot bind me more to you, my lord. Farewell till we renew... I trust, renew A converse ne'er to disunite again.