Video shows what duck means. To lower the head or body in order to prevent it from being struck by something.. To lower (something) into water; to thrust or plunge under liquid and suddenly withdraw.. To go under the surface of water and immediately reappear; to plunge one's head into water or other liquid.. duck synonyms: Wikisaurus:friend. duck pronunciation. How to pronounce, definition by Wiktionary dictionary. duck meaning. Powered by MaryTTS