(bound form) to seal; to close; to keep silent as in 缄口 jiān​kǒu or 缄默 jiān​mò; to seal a letter (often used on envelopes following the sender's name)

(bound form) a letter or piece of correspondence

(literary) measure word for letters or pieces of mail

(literary) ropes or cords used to bind a chest or trunk

(literary) to tie up; to bind with ropes or cords