Pronunciation: [wˈɜːt fˈasənd] (IPA) 
The phrase "wert fastened" is an archaic form of "were fastened" and is pronounced as /wɜrt ˈfæstnd/. In old English, the word "wert" was used for the second person singular, meaning "you were". The addition of "fastened" means that something was firmly secured or attached. This phrase was commonly used in literature and poetry of the past, but in present-day English, "were fastened" is the more commonly used phrasing.
"Wert fastened" is an archaic term with its roots in Middle English and Old English, specifically derived from the verb "be" in the second person singular past form, "wert," combined with the adjective "fastened."
The verb "be" denotes existence or identity; however, in this context, it has an auxiliary function, conveying a state of being or action. The term "fastened" refers to the act of securing or attaching something firmly in place. Therefore, when combined, "wert fastened" can be understood as an older form of the phrase "were fastened," indicating that someone or something was securely attached or anchored in a particular manner in the past.
In modern English, the usage of "wert fastened" has become obsolete and is no longer commonly employed in everyday conversation or writing. Its use is generally restricted to literature, specifically texts from earlier periods in English history, such as Middle English or Old English works. Due to its antiquated nature, its comprehension and usage may require familiarity with dated linguistic styles.
Overall, "wert fastened" is an archaic phrase used to describe a situation or condition where something or someone was securely anchored or attached in the past.
The phrase "wert fastened" is formed by combining the archaic second person singular form of the verb "to be" (wert) and the past participle form of the verb "to fasten" (fastened).
The etymology of "fasten" can be traced back to the Old English word "fæstnian", which meant "to make fast, secure, or fix". It is derived from the Proto-Germanic word "fastinōną". This word has cognates in other Germanic languages, such as Old Norse "fasta", Old High German "fasten", and Gothic "fastan".
On the other hand, the verb "to be" and its various forms have a complex history. In the case of "wert", it is the second person singular form of the past subjunctive of "to be" in Middle English.
