In message , at
18:42:19 on Wed, 11 Jan 2017, Arthur Figgis
remarked:

Some are much better than that. I knew what we might call a barrister in
Germany who was German but had spent some time in the USA. His accent
was indistinguishable from a mother tongue USA-ian.

But how did he use the word "since"?

No idea.
--
Roland Perry