Eff
Know
Know verb - To have a practical understanding of.
Mutual synonyms
Both words in one sentence
- I know you don't approve of swearing, so we'll sort that out: you are a boring eff-star-star-CUNT.
Source: Boring Insult - Sorry, I know that you disapprove of swearing, so I'll sort that out: you are a boring eff-star-star-cunt.
Source: Last-Second Word Swap
Cite this Source
Know and Eff. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/eff/know
Eff & Know. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/eff/know>.
Know or Eff. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/eff/know.
Google Ngram Viewer shows how "eff" and "know" have occurred on timeline