no-entry sign
nounUK /ˌnəʊ ˈentri saɪn/
US /ˌnoʊ ˈentri saɪn/
A sign that tells people they must not go in.
The driver stopped because a no-entry sign blocked the road.
OTHER MEANINGS
2. A symbol on a door or gate showing that people are not allowed inside.
A no-entry sign was posted on the factory door.
3. A notice in a computer system that stops users from opening a place.
The website showed a no-entry sign when I tried to visit the page.
4. A red circle sign used on roads to stop cars from going the wrong way.
The no-entry sign at the exit warned cars not to turn in.