a barrier set up by police to stop traffic on a street or road in order to catch a fugitive or inspect traffic etc.
render unsuitable for passage
block off with barricades
a barrier (usually thrown up hastily) to impede the advance of an enemy
prevent access to by barricading
a person or thing that is a resource that helps make something easier or possible to do
the activity of contributing to the fulfillment of a need or furtherance of an effort or purpose
gift of money or other material help to support a person or cause