Definition
Completely finalized and official, particularly after all required documents have been signed.
（文件等）簽署用印，正式生效
The agreement is signed and sealed, so we can now proceed with its execution.
協議已經簽署並蓋章，所以我們現在可以開始執行了。
Once the contract is signed and sealed, there is no room for any modifications.
一旦合同簽署並蓋章，就沒有任何修改的餘地了。
The merger was signed and sealed after the board of directors gave its approval.
在董事會批准後，合併案正式簽署並蓋章。