Originally Posted by HillRider

It will never disappear but people won't (and most already don't) know its origin. We still use many phrases that we know what they mean but few have any idea where they came from:

"Lock, stock and barrel"
"Three sheets to the wind"
"A flash in the pan"
"Being put through the wringer"

And of somewhat more recent vintage:

"Dial a phone"
"You sound like a broken record"

There are lots more.