Meaning: envelope 
'envələʊp
n.
a flat rectangular paper container for papers
any wrapper or covering
a curve that is tangent to each of a family of curves
a natural covering (as by a fluid)
the maximum operating capability of a system
the bag containing the gas in a balloon
back of the envelope Idiom, Proverb
stretch the envelope
Push the envelope
This means to go to the limits, to do something to the maximum possible.envelope
envelopepush the envelope
1) To increase the operating capabilities of a technological system.
2) To exceed the existing limits in a certain field; be innovative.
back-of-the-envelope
Describing something, usually a calculation, that is approximated in a quick, informal, and asperous manner, as ability be sketched out on a atom of cardboard (such as the aback of an envelope). When it came time to pay the bill, we had to do some back-of-the-envelope calculations to amount out who owed how much. These are aloof some back-of-the-envelope figures, but it looks like we should accept abundant money to pay for the renovation.Dictionary
More Idioms/Phrases
enough to sink a ship enter enter the lists enterprise entirety envelope envy Eocene equal errand error escape escape notice back-alley backassed back-assward backbone back-breaking backburner back-cloth star backdoor backdoor man backdoor trot backdoor trot(s) backdoor trots backed backed up back-ender backer backfire backfire on backfire on someone backgammon player background backhanded backhanded compliment backhander backing back-of-the-envelope back-of-the-envelope calculation back-order backpedal backroom backroom boy backseat backseat driver backside backslapper backslider backstabber backstairs influence back-to-back back-to-back-to-back backward backward and forward backward(s) about coming forward backward(s) and forward(s) backwater backyard bacon bacon-faced bacon-fed bad bad actor
An back of the envelope idiom dictionary is a great resource for writers, students, and anyone looking to expand their vocabulary. It contains a list of words with similar meanings with back of the envelope, allowing users to choose the best word for their specific context.
Dictionary of similar words, Different wording, Synonyms, Idioms for Idiom, Proverb back of the envelope
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