Pronunciation: [bɹˈʌʃ əpˌɒn] (IPA) 
The phrase "brush upon" is spelled as /brʌʃ əˈpɒn/. The first syllable "brʌʃ" is pronounced with a short "u" sound followed by "sh," while the second syllable "əˈpɒn" is pronounced with a schwa sound and a short "o" sound. This phrase means to briefly review or mention something, often in passing. It can be used in both formal and informal contexts, such as in a casual conversation or a professional presentation.
The phrase "brush upon" refers to the act of briefly reviewing or refreshing one's knowledge or understanding of a particular subject or skill. It involves lightly touching upon a topic to remind oneself of the key points or to ensure that one's existing knowledge remains up to date.
When individuals "brush upon" a subject, they typically engage in a quick and superficial exploration, usually for the purpose of refreshing their memory rather than gaining in-depth understanding. This can involve skimming through notes, reading a brief summary, or engaging in a concise review of the main concepts. It is often used when individuals need to quickly recall information before an exam, presentation, or discussion related to a specific topic.
The term "brush upon" emphasizes the idea of a swift and light contact with a topic, similar to the gentle touch of a brush. It implies a brief encounter rather than a thorough or deep dive into the subject matter.
Overall, "brushing upon" a subject implies a desire to quickly refresh one's understanding or recollection of a topic without engaging in extensive studying or detailed analysis. It serves as a reminder or update of knowledge previously gained, allowing individuals to feel more confident and informed when discussing or applying that knowledge.
The phrase "brush up on" doesn't have a specific etymology because it is a combination of two separate words: "brush" and "up".
The word "brush" originates from the Old French word "broisse", which means "twigs or brushes made from twigs". It developed from the Vulgar Latin word "bruscia", meaning both "burnt twigs" and "brushwood".
The word "up" has Old English origins and is related to the Old Norse word "upp", both meaning "upwards". It is derived from the Proto-Germanic word "upp", which shares the same meaning.
When combined, "brush up" means to improve or refresh one's knowledge or skills in a particular subject or area.
