1. a person who engages in a filibuster; one who obstructs legislative proceedings by prolonged speech or other delaying tactics
Usage: chiefly political; often used in U.S. Senate context
2. a person who engages in unauthorized military action in a foreign country; a mercenary or adventurer
Usage: historical; less common in modern usage

Examples

• The senator became known as a filibusterer after blocking the bill with a 12-hour speech.
• Critics accused the filibusterer of wasting the Senate's time on procedural delays.
• The filibusterer's tactics prevented a vote on the controversial legislation.
• Historically, filibusterers from the United States conducted raids in Central America.
• The opposition party's filibusterer managed to delay the confirmation vote by several days.