push the envelope

Meaning

1. to go beyond the limits of what is allowed or thought to be possible

   He is a performer who consistently pushes the envelope of TV comedy.

From the same entry

• be pushing 40, 50
• be pushing up daisies
• push the boat out
• push your luck
• push to the back of your mind
• push all the buttons
• press the panic button
• push about
• push ahead
• push aside
• push back
• push back