Pronunciation: [sˈʌb wˈe͡ɪ] (IPA) 
The correct spelling of the word "subway" is /ˈsʌbˌweɪ/. It is made up of the prefix "sub-" meaning "below" and "way" meaning "a path or route". The word refers to an underground train or pedestrian passage. Many people misspell it as "sub way", separating the two parts of the word. However, the correct spelling is one single word, with the stress on the first syllable /ˈsʌb/, and the second syllable pronounced as /ˌweɪ/.
Subway is a noun that can refer to two distinct definitions. Firstly, it can indicate an underground electric railroad system or network that transports passengers within a city or urban area. Such a system is commonly found in major cities around the world and serves as an efficient means of public transportation. The term "subway" is often used interchangeably with "metro" or "underground." It typically comprises a series of interconnected tunnels and tracks, with trains running at regular intervals to transport commuters and travelers.
Secondly, subway can also refer to an underground passage or walkway that pedestrians use to cross beneath a road, railway, or other obstacles. These subways are designed to ensure the safety and convenience of individuals who need to traverse busy streets or areas with heavy vehicular traffic. Such passages are often constructed with the intention of enhancing pedestrian flow and reducing the risk of accidents or congestion above ground.
In summary, "subway" can either denote an underground electric railroad system or an underground passage for pedestrians. It is an essential component of urban infrastructure, providing a reliable and efficient mode of transportation for commuters as well as safe and convenient pathways for pedestrians in busy areas.
The word "subway" originated in the late 19th century in New York City. It comes from the combination of the prefix "sub-", meaning "under" or "below", and "way", referring to a passage or route. The term was originally used to describe an underground pedestrian tunnel or walkway used for moving people beneath the streets of the city. Over time, the term "subway" became specifically associated with the underground transit system, popularly known as "subways", which emerged in several cities worldwide.
