Pronunciation: [kˈʌm wˌɒn] (IPA) 
The correct spelling of the phrase "come one" is actually "come on". The pronunciation of "come on" in IPA phonetic transcription is /kʌm ɒn/. The word "on" is spelled with just one "o", not with an "e". It is often used as a colloquial expression to encourage someone to do something or to express disbelief. Therefore, it is important to spell it correctly to avoid confusion and misunderstanding in written communication.
The phrase "come on" is an idiomatic expression primarily used as an exhortation to encourage or urge someone to act or do something. It is often employed to motivate or persuade someone to accelerate their progress, effort, or achievement in a specific task or situation.
The phrase can also serve as a command or invitation for individuals to join or participate in a particular activity, event, or endeavor. In this context, it is commonly used in a social or collaborative setting to rally others and engage them in a shared experience or objective. Additionally, "come on" can function as a plea or call for assistance or support, seeking aid or collaboration from others.
Furthermore, "come on" can serve as an expression of disbelief, usually used when someone finds another person's statement or action implausible or questionable. In this usage, it often conveys skepticism or an invitation for further explanation or clarification.
The phrase originated from the verb "come" combined with the preposition "on," which typically intensifies the original verb's meaning. Through evolution in language usage, "come on" has gained various colloquial and pragmatic interpretations depending on the context and intention of the speaker.
The phrase "come one" does not have a distinct etymology as it is a combination of two separate words: "come" and "one". However, we can examine the origins of each word individually.
1. "Come":
The word "come" originated from the Old English word "cuman" or "cyme", which had a similar meaning. This Old English word can be traced back to the Proto-Germanic word "kwemanan" and further to the Proto-Indo-European root "*gwem-", meaning "to go, come".
2. "One":
The word "one" stems from the Old English word "an" which had the same meaning. This Old English word can be traced back to the Proto-Germanic word "*ainaz" and the Proto-Indo-European root "*oinos" indicating "one, unity".
