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Webster 1913 Edition

Verb.

[1st pref.

un-

nest

To eject from a nest; to unnestle.

[R.]

T. Adams.

unnest ‎(third-person singular simple present unnests, present participle unnesting, simple past and past participle unnested)

To eject from a nest.
(Can we find and add a quotation of T. Adams to this entry?)
To separate objects that have been nested or placed one inside the other.
- 1988, Edmund White, The Beautiful Room is Empty, New York: Vintage International, 1994, Chapter One,
  She unnested the coffee cans and used the top one as an ashtray.