also: ちょくひ
personal; confidential (on a letter)
Written on the outside of a letter to indicate it is personal and should be opened only by the addressee. Used in formal or traditional correspondence.
A letter marked '直披' on the envelope should not be opened by anyone other than the addressee.
In old letters, words like '直披' and '親展' were often used.
Alternate reading ちょくひ is less common but attested in formal contexts.
Compound of 直 (direct, personal) and 披 (open, reveal). The exact historical derivation is uncertain, but the term is conventionally used in formal letter writing.