unseal

From un- +‎ seal.

• enPR: ŭn-sēl', IPA^(key): /ʌnˈsiːl/
• Rhymes: -iːl

unseal (third-person singular simple present unseals, present participle unsealing, simple past and past participle unsealed)

1. (transitive) To break the seal of (something) in order to open it.
2. (intransitive) To open by having a seal broken.
   • 2017, Paul Crilley, Clockwork City: Delphic Division 2:

     But it's just the equalising of pressure as the vault door unseals.

• unsealer
• unsealing