To shut, usually permanently.
1. Fermer.
2. Interdire.
3. Empêcher. Barrer la route.
4. Rayer. Barrer un chèque.
5. (Pron.) (Familier) Se sauver. Se barrer ŕ toute vitesse.
When you close off an area/you prohibit people from entering it or passing through it by locking the door or blocking the entrance.