As a language expert with a deep understanding of the English language, I'd like to address the question of whether "thru" is a proper spelling and when it might be appropriate to use it.
Firstly, it's important to understand that language evolves over time, and what is considered standard or formal can change. However, for the purposes of clarity and to maintain a level of professionalism, especially in formal writing and academic contexts, it's crucial to adhere to the currently accepted standards.
Thru is indeed a nonstandard spelling of the word through. It is an informal, colloquial abbreviation that has been used, particularly in informal contexts and signage, to save space or for stylistic purposes. For instance, one might see "Cafe Open 24/7 - Enter thru the side door" as a sign outside a coffee shop. It's also common in certain dialects or regional speech patterns.
On the other hand, through is the standard spelling that is widely accepted and preferred in formal writing, academic papers, legal documents, and any other context where a high level of language precision is required. It is the correct spelling to use when indicating movement from one side of an object to the other, the continuation of an action, or the passage of time.
The preference for through over thru is not just a matter of formality but also of clarity. In some contexts, especially in writing, the nonstandard abbreviation could potentially lead to confusion or be misinterpreted, which is why it's generally avoided.
However, it's worth noting that language is also a tool for communication, and in certain informal or creative contexts, using "thru" might be acceptable or even add a certain charm or character. For example, in poetry, song lyrics, or casual conversation, the use of "thru" might be seen as more approachable or relatable.
In conclusion, while thru can be found in certain informal contexts and might be considered acceptable in those situations, through is the preferred spelling for all formal writing and situations where clarity and precision are paramount. It's always best to err on the side of caution and use the standard form unless you have a specific reason for using the nonstandard abbreviation.
read more >>

Both thru and through communicate the same meaning, but one is widely favored over the other. Thru is a nonstandard spelling and should generally be avoided. Through is the preferred spelling and is the correct choice for all formal writing.read more >>