封書
Meanings
1
Refers to a letter that is sealed in an envelope, as opposed to a postcard or open correspondence. Often used in official or formal contexts.
Please send important documents by sealed letter.
A sealed letter arrived, so I opened it immediately.
Usage patterns
- 〈物〉を封書で送るto send something as a sealed letter
I sent the important documents as a sealed letter.
- 封書にするto put (a letter) into a sealed envelope
I decided to send it as a sealed letter instead of a postcard.