Flipper
Flipper noun - The flat broad limb of aquatic animals specialized for swimming.
Sure
Both words in one sentence
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Skipper tells him to stop as this is inappropriate behavior for the dinner table, so he grudgingly does, but takes a moment to rub his flipper over the serrated edge of the knife when he makes sure no one is looking.
Source: Five-Finger Fillet
Cite this Source
Sure and Flipper. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/flipper/sure
Flipper & Sure. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/flipper/sure>.
Sure or Flipper. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/flipper/sure.
Google Ngram Viewer shows how "flipper" and "sure" have occurred on timeline