Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. To separate, as sisters; to disjoin.

from the GNU version of the Collaborative International Dictionary of English

  • transitive v. To separate, as sisters; to disjoin.

from The Century Dictionary and Cyclopedia

  • To deprive of a sister; separate, as sisters.

Etymologies

un- +‎ sister (Wiktionary)

Examples

  • Ay, that was in her hour of joy; there will be plenty to sunder and unsister them again: this Gardiner for one, who is to be made Lord Chancellor, and will pounce like a wild beast out of his cage to worry Cranmer.

    Queen Mary and Harold

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