I don't have a thorough understanding of why you asked that question.
It means to be done or over with. HOPE THIS HELPS!
The teacher was surprised by the thoroughness of the narrative done by the student.
Thank you for your very thorough example.
After presenting his argument, she offered a thorough rebuttal highlighting the flaws in his reasoning.
He had a thorough understanding of the subject, so he was a very good lecturer.
I went to a comprehensive school to complete my secondary education. The repairs to the water system were comprehensive and thorough.
When the media reported the surreptitious business deals with the legislator's brother, the public demanded a thorough investigation
i hate that word, likewise, i use it in this sentence
Thorough means with detail.The health inspector was very thorough with his inspection of the kitchen and he found rats in the cupboards.
The headmaster called me into his office and gave me a thorough telling off for breaking the window.
A thorough physical examination of a person may take a physician many hours.
You just did, or you could just use the sentence "I don't know how to use overtaken in a sentence."