British to prevent traffic from using a road by putting special objects that are shaped like cones on itusually passive
The southbound lane was coned off because of roadworks.
phrasecone off cone off sth • cone sth offBrE to put a line of cones (=large plastic objects) on part of a road, in order to stop cars from using it: The fast lane had been coned off because of the accident.The streets around the stadium were coned off by the traffic police.