noun, noun which may take the genitive case particle 'no'
not going outside; not letting outside; safekeeping
Used for keeping someone or something from going out, or for staying inside oneself. The 'safekeeping' nuance appears in contexts like keeping a person or item securely indoors. Often used in the pattern 不出を命じる (order confinement) or 不出にする (keep inside).
He was ordered by his family not to go out.
I keep the important documents securely inside the safe.
never taken out of the premises; kept strictly within the family/group; not for public viewing
Compound of 不 (not) and 出 (go out). The exact historical derivation is uncertain, but the meaning follows directly from the kanji.