Pushing the envelope: expression
meaning:
to strech the boundaries of something
to go beyond the known limits of safe performance
a set of performance limits that may not be safely exceeded
to test the limits of what is permissible in a given situation
origin:
This expression comes out of the US Air Force test pilot program of the late 1940's onwards. The "envelope" was the technical limits of the high performance airplanes that test pilots flew, ie., the designers technical specifications. So, to "push the envelope" was to go beyond these specifications to see just exactly what these aircraft would do. I'll take a wild guess and say that they mostly crashed.
The expression was popularised by Tom Wolfe in his book "The right stuff" (1979) and then the movie "Top Gun." Because the section of Wolfe's book in which it first appears focusses heavily on Chuck Yeager's exploits, it is tempting to ascribe the coinage to him, but the phrase was just a general Air Force test pilot one.
The idea of of using the word "envelope" as a kind of enclosing boundary is not a new one. In 1899 Arnold Bennett wrote: "My desire is to depict the deeper beauty while abiding by the envelope of facts."
usage:
Modern technology is pushing the envelope of what can be done with a computer. Everyday there seems to be some new gadget out that lets us do something more or something better on our computers.
Excerpted from Taiwan Teacher ----Maria