Definitions of barricade:

• noun:   a barrier (usually thrown up hastily so as to impede the advance of an enemy)

  Example: "They enemy stormed the barricade"

• noun:   a barrier set up by police to stop traffic on a street or road in order to catch a fugitive or inspect traffic etc.
• verb:   block off with barricades
• verb:   prevent access to by barricading

  Example: "The street where the President lives is always barricaded"

• verb:   render unsuitable for passage

  Example: "Barricade the streets"