/
ˈfɪlɪbʌstə/
n.
  - prolonged speaking or other action which obstructs progress in a legislative assembly while not technically contravening the required procedures.
 - historical a person engaging in unauthorized warfare against a foreign state.
 
v.
 
[
often as noun filibustering]
 obstruct legislation with a filibuster.
Etymology
C18: from Fr. flibustier, first applied to pirates who pillaged the Spanish colonies in the West Indies, influenced by Sp. filibustero, denoting American adventurers who incited revolution in Latin America; ult. from Du. vrijbuiter ‘freebooter’.