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Webster 1913 Edition

Verb.

[1st pref.

un-

seam

To open the seam or seams of; to rip; to cut; to cut open.

Shak.

Verb.

To rip; to cut open.

unseam ‎(third-person singular simple present unseams, present participle unseaming, simple past and past participle unseamed)

(transitive) To open the seam or seams of; to rip; to cut open.
- 1603-06, William Shakespeare, Macbeth (act 1, scene 2)
  Till he unseam'd him from the nave to th' chaps, and fix'd his head upon our battlements.