UNSEAL
unseal
(verb) break the seal of; “He unsealed the letter”
Source: WordNet® 3.1
Etymology
Verb
unseal (third-person singular simple present unseals, present participle unsealing, simple past and past participle unsealed)
(transitive) To break the seal of (something) in order to open it.
(intransitive) To open by having a seal broken.
Source: Wiktionary
Un*seal", v. t. Etym: [1st pref. un- + seal.]
1. To break or remove the seal of; to open, as what is sealed; as, to
unseal a letter.
Unable to unseal his lips beyond the width of a quarter of an inch.
Sir W. Scott.
2. To disclose, as a secret. [Obs.] The Coronation.
Source: Webster’s Unabridged Dictionary 1913 Edition