also: ひしがくし
noun
Archaic noun for hiding something or covering up a matter; not used in modern everyday speech.
古文書には「秘し隠し」という語が隠蔽の意味で使われている。
In old documents, the word 秘し隠し is used to mean concealment.
Modern standard term for cover-up or concealment; 秘し隠し is its archaic predecessor.
Compound of 秘し (stem of 秘する, 'to keep secret') and 隠し (stem of 隠す, 'to hide'). The exact historical derivation is uncertain, but it follows a pattern of archaic noun formation from verb stems.