The term "fork tongues" is often used to describe someone who speaks insincerely or dishonestly. The spelling of this word is influenced by its pronunciation in IPA phonetic transcription, which is /fɔːk ˈtʌŋz/. The "f" is pronounced as a voiced dental fricative, while the "r" is pronounced with a slight retroflexion. The "o" in "fork" is pronounced as an open-mid back rounded vowel, and the first "u" in "tongues" is pronounced as a central unrounded vowel. The final "s" in "tongues" is pronounced as a voiceless alveolar fricative.
The term "fork tongues" is formed by combining the words "fork" and "tongues".
The word "fork" stems from Old English "forca", which means "pitchfork", "forked instrument", or "forked branch". Eventually, it became used metaphorically to refer to a bifurcated or divided object, such as a fork in the road or a fork in a river.
The word "tongues" refers to the human organ of taste and speech, among other meanings. It comes from Old English "tunge", which has Germanic origins and is related to the Dutch "tong" and German "Zunge".
Therefore, the term "fork tongues" seems to combine these two words metaphorically, suggesting speech that is divided, deceitful, or duplicitous. It is often used to describe someone who speaks with dishonesty or insincerity.