Pronunciation: [ɹˈɛd fˈe͡ɪs] (IPA) 
The spelling of "red face" is fairly straightforward in English. The "red" is pronounced as /rɛd/ with the "e" being a short "eh" sound. The "face" is pronounced as /feɪs/, with the "a" being a long "ay" sound. Together, the two words are pronounced as /rɛd feɪs/. The spelling accurately captures the sounds of the spoken word, and serves as a useful tool for clear communication in writing.
Red face refers to a physiological response characterized by the reddening of one's facial skin due to various factors. It is a temporary condition that often occurs spontaneously and can be attributed to several causes, including embarrassment, shame, anger, excessive heat, certain medical conditions, or consumption of certain substances. When individuals experience intense emotions such as embarrassment or shame, blood vessels in their face dilate, causing an increased blood flow to the skin's surface, resulting in redness. This reddening is often noticeable in the cheeks, forehead, or neck, giving rise to the term "red face."
Furthermore, red face can also be caused by external factors like hot weather or exposure to extreme temperature conditions. High temperatures cause blood vessels near the surface of the skin to dilate, allowing for better cooling. However, this dilation can lead to a reddening of the face due to increased blood flow. Similarly, certain medical conditions such as rosacea or flushing syndrome can cause frequent or chronic red face episodes.
In addition, the consumption of certain substances like alcohol, spicy foods, or certain medications may trigger a red face response in some individuals. Alcohol, in particular, can cause facial flushing by dilating blood vessels and increasing blood flow.
Overall, red face refers to a temporary condition characterized by the reddening of the facial skin due to various physiological or external factors.
The etymology of the term "red face" is relatively straightforward. It is a compound term comprising of two separate words: "red" and "face".
1. Red: The word "red" has its origins in Old English "rēad", which can be traced back to the Proto-Germanic word "raudaz". This word, in turn, comes from the Proto-Indo-European root "*h₁rewdʰ-", meaning "red" or "ruddy". "Red" has always been associated with the color of blood and has been used to describe various shades of redness.
2. Face: The word "face" comes from Middle English "face", which is derived from Old French "face", ultimately from the Latin word "facies". "Facies" refers to the front part of the head, including the forehead, eyes, nose, mouth, and chin.
