barricade

Short definition from Wiktionary

Noun

1. 1
   A barrier constructed across a road, especially as a military defence
2. 2
   An obstacle, barrier, or bulwark.
3. 3
   A place of confrontation.
4. 4
   Line of people standing behind or closest to the barricade in the pit section of a live music concert.

Verb

1. 1
   To close or block a road etc., as, or using, a barricade.
2. 2
   To keep someone in (or out), using a blockade, especially ships in a port.