what does it mean 'push the envelope'?

[Chahra]

English Language Tests, Intermediate level

ESL/EFL Test #293 "English Slang Idioms (15)", question 8

She knew that she was really pushing the ......... by putting that racy picture of a girl in a skimpy bikini on front page of the local paper.

(a) acceptability
(b) envelope
(c) perimeter
(d) buttons

English Language Tests, Intermediate level

ESL/EFL Test #293 "English Slang Idioms (15)", answer 8

She knew that she was really pushing the envelope by putting that racy picture of a girl in a skimpy bikini on front page of the local paper.

Correct answer: (b) envelope
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what does it mean 'push the envelope' ?

Chahra

[Linda]

Hello Chahra,
The meaning is: "To attempt to extend the current limits of performance. To innovate, or go beyond commonly accepted boundaries.." In this case, it's the latter meaning in bold letters.
Take care.
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