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Definition of Swift boat
1. Noun. A small, shallow draft water vessel used by the United States Navy for counterinsurgency (COIN) operations during the Vietnam War; Fast Patrol Craft (PCF). ¹
2. Verb. (US neologism pejorative transitive) to put forth sensational negative stories about a political figure as part of a smear campaign against them, especially regarding their military record ¹
¹ Source: wiktionary.com