A prohibition on entering (or entering and exiting) a place — a ban preventing people from accessing a building or venue; also the sign indicating such a ban.
暴力行為を繰り返した彼は、そのクラブから出入り禁止になった。
He was banned from entering that club after repeatedly engaging in violent behavior.
工事中のため、この区域は関係者以外出入り禁止です。
Due to construction, this area is off-limits to anyone except authorized personnel.
掲示板に『出入り禁止』と書かれた張り紙が貼ってあった。
A notice reading 'No entry' was posted on the bulletin board.