Pronunciation: [θɹˈuː] (IPA) 
The spelling of the word "thru" is often used as a casual abbreviation for "through". It is spelled phonetically as /θruː/, with the initial "th" sound followed by a long "u" sound and a prolonged "oo" sound. This spelling is commonly used in signs, menus, and roadways in American English. While some language purists may argue against its use, "thru" has become an accepted alternative spelling in informal contexts.
Thru is a shortened and informal spelling of the word "through." It is commonly used in casual or informal contexts, such as in spoken language, text messages, and informal writing. Thru is typically written without the use of the letter "gh," which is present in the standard spelling of "through."
Used primarily as a preposition or adverb, thru indicates movement or passage from one side of an object, location, or situation to the other. It conveys the notion of traveling within or across a physical or figurative entity, such as going through a tunnel, reading a book from start to finish, or experiencing a process from beginning to end. Thru can also imply progress, advancement, or attainment of a goal or objective.
While considered less formal than the standard spelling, thru is widely understood and accepted in informal settings. However, in more formal or professional contexts, it is advisable to use the conventional spelling "through" to maintain a higher level of professionalism and adherence to standard grammar and spelling rules.
It is worth noting that the spelling of thru may vary across regions and among individuals, as language and orthographic conventions can differ. Nevertheless, regardless of the spelling used, the intended meaning of progressing, transiting, or undergoing an action or experience from one side to the other remains consistent.
The word "thru" is an abbreviation of the word "through". It emerged in the early 20th century as a shorthand version that aimed to simplify the spelling and enhance efficiency, particularly in advertising and signage. It is considered an informal or colloquial spelling of "through" and is primarily used in American English.
