vt. 开封, 开启, 使解除束缚

[ verb ]
break the seal of
<verb.contact>
He unsealed the letter

Unseal \Un*seal"\ ([u^]n*s[=e]l"), v. t. [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.