He practiced the excellent manners of a gentleman, and behaved in public like a nobleman of a bygone era.
That pencil is a memento from a bygone era.
Our attic is more like a garret filled with old things of bygone days.
Anything in the past has bygone.Bygone almost means the same thing as Gone by.
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use it by saying- how can you use the word ebullient in a sentence?
Can you use the word concluding in a sentence? Done.
How can you use the word infectious in a sentence
You can use the word Truss in a sentence like this.
A bygone is an event which occurred in the past.
Just use it! Or do you mean, can you use the word beheld in a sentence.
You can use an underscore to remove a word out of a sentence. It can be placed where the word was.
Since that is not a word I would not attempt to use it in a sentence.