The word 'filibuster' derives from a Dutch word meaning 'freebooter' or pirate.
Notes on verification
Multiple independent etymological references (Etymonline, Merriam-Webster, Wiktionary, NPR) agree on the Dutch 'vrijbuiter' origin, transmitted through French and Spanish before entering English. [cascade flags: wikipedia_dropped_other_sources_exist | tier=silver indep_score=0.887 clusters=4 claim_tier=notable | framework convergence=partial on standard historical linguistic/etymological scholarship (OED and related etymological dictionaries) (upstreams: Oxford English Dictionary, Century Dictionary) — publishers independent, evidence may not be | kind=empirical eligibility=high]
Sources
- Filibuster, cloture: US Senate rules featured in abortion debate | Politics News | Al Jazeera (seed:politics_and_current_events)
- https://www.etymonline.com/word/filibuster (corroboration)
- https://www.merriam-webster.com/wordplay/filibuster-word-history-origin (corroboration)
- https://waywordradio.org/filibuster-freebooter/ (corroboration)
- https://www.npr.org/2005/05/18/4656990/history-of-the-word-filibuster (corroboration)